In my opinion, when you can that easily, and with a game with Tales' history, it makes a lot of sense to go the dragon quest treatment for another long running rpg franchise with protagonists that all use the same B moves.
Again: You focus too much of if you could, and not enough on if you should.
Lloyd is from the game's real breakout hit, was the best-selling game in the series and still is (Though Vesperia's catching up fast), and is by far the most consistent Smash request. Yuri is consistently a high-ranker in the polls (Though if the recent Tales of Festival is any indication, Lloyd is
also catching up), and gets used in crossovers a lot. Logic dictates that these two would be our best bets, since they have a lot of merits to them and are very recognizable in the context of the franchise.
Now, Cress does have a couple merits, like being the forefather of most other Tales protagonists... But he wouldn't be chosen just to have more names available on the select screen. That's not how Smash works. The Heroes were practically different versions of the same character, but the Tales characters are all different characters with different personalities, and forcing them into the same slot is gonna cause some issues.
The difference of that false equivalency is if you gave me Lloyd's B moves for Smash, you'd give me demon fang, tiger blade, as definites. Maybe you disgree about which artes B down and B forward would be, but they would still 99% be the same ones as other Tales protagonists.
And his main method of combat would be fight with a sword. Of a similar size to all other Tales protagonists.
And his body type and build is.... the exact same as all the other Tales Protagonists (except Yuri, who uses a different set and that game specifically has Flynn for the typical Tales protagonist set. Tales knows there's a typical Tales protagonist set. They literally made a character separate from a protagonist as the exception to the rule to show it.)
Ah, I see. Just like how Spring Man has Ribbon Girl, Min Min, and Ninjara as alts, because they have a similar body type, stretchy arms, and can equip each other's ARMS.
Oh wait.
They're not going to force in a bunch of different alts just to represent the archetype. Just one is enough. They don't need any alts, and if packs like Joker's and Sephiroth's are any indication, they'd probably just focus on a single game anyways.
