Some of my impressions from the tournament:
Nairo's bracket in winners top 8 was potentially very good for him with players he does well against (Void, Ally, Larry), yet his top 8 performance was very unimpressive.
People have got to learn the Marth MU (like for real, quit getting your shields broken). It's just expected players will improve against Leo, not that Leo is going anywhere. I don't say this because I think Marth is a fraud or something, I say this because Marth is clearly an addition to the top tiers and with Leo as a traveling top player, this is just a MU every top player is gonna have to know.
FOW's performance was pretty good, losing to Fatality is kinda eh but I'm not gonna try to take a whole lot away from this considering FOW hasn't been around in a while and ZeRo was in his pool. But I was reminded how crazy good Ness's edge guarding and two framing is, even on some of the best recoveries like Bayonetta, and without having to give up stage control.
M2's nair footstool is stupid as hell.
Leo is just as good or better at ledge trapping than ZeRo. ZeRo can get damage at the ledge pretty consistently, but Leo is just ridiculously dangerous when he has you on the ledge, always able to pull out tippers and cover everything with Marth, or abuse Cloud's ledge coverage. Leo vs Marss at UGC was absolute destruction of Marss when he was on the ledge. That said, Larry had a couple issues with Leo's ledge presence, but just in general Fox doesn't struggle that badly on the ledge against a lot of characters. He only has one mixup, but it's a great mixup that can give him the entire stage back. It's very hard for characters to cover all of his ledge options at once. I know Rosa can, at least. A lot of top tier disadvantage states like Sheik and ZSS still very much struggle at getting off the ledge.