Your whole point is that Roy being DLC doesn't change that he wasn't cut when my argument was that you stated "Fire emblem characters have been being cut since brawl" when really only one has ever been cut.
Ah, I misread what your point was, then. People don't expect the full FE roster in every game bar DLC was the main point, though.
Your second paragraph about Corrin is invalid because that's the same thing that happened with Ike and he was not cut.
Ike was nowhere near the same situation, so is an invalid comparison in itself. He was continued to be pushed among products even after his games were done. He also was updated for some new games in Smash 4 that he was in. Corrin, if he doesn't get any new games, may be on the cutting block. Ike is too popular and the second biggest FE character of all time. To pretend Corrin is comparable is just being silly. Last minute additions can potentially be cut if there's reasons to do so. Never mind that Corrin only exists(like Roy) as a quick addition to push the latest game. Roy was cut and put as low priority(which is part of why the cut was easy) after his game was irrelevant. To act like Corrin can't possibly be put in the same situation is silly. Unless Fates suddenly continues with another game during Smash 5's development, it'd further serve the team more to add someone just as interesting from the latest game to push that product. Since obviously Smash 5(not referring to a port here) will have cuts anyway due to balance issues when it comes to over 60 characters, some have to go. Roy and Corrin are the only two remotely among the Fire Emblem choices that make any sense to cut. Both are currently irrelevant, neither are easy to remake, and they need more space for newer characters. This is also why Pokemon tends to have cuts since Brawl as well. Mewtwo barely is relevant as is, with small bursts, and couldn't make it into the base game of Smash 4 in the one time he was other than Melee(he wasn't nearly as relevant in 64 as in Melee), and now that its moment is over, it's the most likely cut to the base roster. Which makes sense, as its always been the lowest priority when it came to Pokemon that will generally return due to popularity. Pichu, Squirtle, and Ivysaur, are far more unique. Pichu wasn't that popular, and while it would've been an easy clone in 4, Pokemon already has a huge roster, so throwing it in(especially with Mewtwo gone at the time) would've just made a bigger upset. As for the other two, they depended on Pokemon Trainer to be worth keeping in. They don't have the remote popularity of Charizard or anywhere near the level of it, so of course the cut was easy.
On your point about him not being in the base game still counts as a "cut". No, it doesn't. Was Pichu "cut" from Smash 4? Was Young Link? The term "cut" refers to a character not being carried over from the previous game. So no, Roy was not "cut" from sm4sh as there was no expectation or basis for assumption that he would be in the game in the first place.
Which also means he may not make it to the base game of Smash 5. Which was kind of the point being made. The two DLC happen to also be the least important FE characters at this time, compared to the other 4 who are way more major right now, or have more going for them.
Young Link was updated into Toon Link. No point in mentioning him. Pichu was, as noted above, not very popular and wouldn't even remotely make sense to bring back when there was already 6 Pokemon playable in Brawl. Most characters don't "skip" a game specifically, they're just planned for the other games. Notice how all the DLC vets were planned for Brawl or already in Brawl? Yeah. We also know for a fact that they put all the Brawl date in the 3DS version, including Roy, so maybe he was planned at one point, but cut from the main roster. Either way, they completely revamped him to be a semi-clone, which explains why he couldn't be in the base roster as is. If he was planned for the base roster at any point, he was cut from it to do a lot more work to make him stand out(and had Lucina as the easy clone choice instead, which does somewhat explain why she was made late in the development beyond the costume factor). We don't know much about Smash 4 development, oddly enough.
Don't let my refutations of your arguments distract from the fact that my argument was never about roy coming back, it was that only one character from FE had ever been cut. There is no basis to assume that another will be cut. Ike wasn't cut from Brawl, that in itself is enough evidence.
There is absolutely evidence that not every character has consistently returned from the Smash franchise FE-wise. Roy being cut from the ideal base roster again is beyond believable. Corrin also has issues that Sakurai was aware of, and is aware of the backlash too from having two FE characters as DLC(something that should not have happened in the first place, as it places bias on a series to the eyes of others, despite the fact it wasn't done for anywhere close to that kind of reason, but it won't stop fans' thoughts on that). Of course, I'm not saying that it should've been Wolf that was back, or, say, Pichu. I'm saying that they could've branched out to other franchises for DLC characters. Letting any single one get more than one caused lots of controversy(and I like Roy more than Corrin, despite the fact I'm saying only Corrin should've been chosen for advertisement purposes).