Sure... because those arguments that say AT’s aren’t a problem have factual evidence and are TOTALLY objective.
Just for the record 0 out of 75 fighters are ATs currently, just saying.
In Smash 4, none of them were part of a Final Smash either. None of them were part of victory poses for other fighters. In Melee none of them were third party. In Smash 4 none of them were owned by a direct console rival. In Smash 4 Ridley was "too big."
When will the Smash base give up these rules of theirs? And, yeah, we have evidence that assists can be turned off.
We know that it already happens. So, since they could just turn it off, why not? Let's break another rule. Sakurai does seem to love doing that, now doesn't he?
For stuff like this, intent is probably more important than the type of content itself. Let's say, for example, a Kingdom Hearts spirit board is released with Sora. Well, the fact they actually released it with him seems pretty telling they don't plan to add him. Now, if they announced a pass 3 that had not begun planning until after the spirit board, then Sora could once again be on the table. Even better for Spring Man, his situation has apparently changed. The time constraint issue is no longer an issue, and clearly, he was their go to pick for some form of ARMS rep back then. Similarly, Rex may be in a similar boat, and, again, he was the favored pick. Elma didn't have the scheduling conflict, yet she still wasn't there.
tfw someone tries to use bias as an objective argument
Who said it's objective? Just remember how biased people there might be in favor of her.
Now, all that said, given that they showed, pretty much the roster during the tease, I'd say it's fairly likely we're getting more than one. Spring Man would be a good choice, in my opinion, to be the default, and, remember, mascots don't have to be the most popular. Marth is a good example of that. He's the mascot, and he's often a given for crossover content, but he's not the most popular. That said, if you were only going to put one FE rep in Smash, Marth would obviously be a strong contender.