Hello everyone, I'm new here as well! Brought here by the news of Min Min and what it might mean for Isaac, who I've been clamoring for in Smash since I played the original game, and Melee, what, around 16/17 years ago?
Anywhooo, I wasn't sure if anyone has brought this up yet, but I've been thinking about it, and honestly if they were going to upgrade an Assist Trophy then Isaac would be the perfect one to do it. He has two perfectly viable replacements for his trophy in Felix and Matthew.
A lot of people like to mention that they wouldn't upgrade Assists because 1) they put effort into them, and 2) it would take effort to replace them, which I feel they'd have to do because otherwise it kind of feels cheap to just up and lose an Assist. But it's not like they're unwilling to model new non-characters; look at the Three Houses map, or Terry's map, they're jam packed full of background characters!
Modeling Matthew or Felix, just one character, would be easy, and they wouldn't have to remake the animations because all three characters use the same push attacks in their game. They made like, what, twenty characters with basic animations for Terry's map?
Would a simple non-detailed model, without an animation change honestly be that difficult?