What I like about F Nanaya is that FF can be used in the high-low mix up. Easily that makes it a killer oki option as both have more or less the same timing. It almost ends up being a guessing game, which is why you see a lot of players in that vid get baited during wake up. And if they guess right? Well it leads to a blockstring, which can lead to ticks... which can lead to oki... well you get the idea.
And the damage versatility looks... fun! I like the stuff that you can do with the flip kick. The new IH mechanic makes his moves all the more interesting as, admittedly, MBAC Nanaya BnBs can get boring at times (which is why you try to land the EX corner combo to amuse yourself). Oh, and 623 is SAFE on wake up from what I see because of the flip. I wonder if you can follow up the flip with an F Dive? Probably not, but that would be awesome if you could!
Who needs whiffs? After the 236a (just one) during a blockstring, he can still somewhat reach with some of his normals, F Dive, or IAD now (since it travels a lot farther).
623BB is only able to be followed after on hit. If you whiff the flip kick, you'll fall straight back down without being able to do anything as if you did a normal shoryu. Those guys just aren't punishing him for some reason. (I've been punished after a blocked 623BB on wakeup)
a safewakeup shoryu would prolly just be like 623B IH, but that'd be only if you're in max sadly
but at least it's kind of like, if you do wakeup shoryu and it hits you get a 2.6k+ reversal, if not you get a free HEAT for life back
I wrote down a list of IH combos a few days ago in the first post. They pretty much all involve cancelling the first hit of 623B and doing stuff after. With IH, you can do some fun stuff I guess.
My personal favorite is 2A 5B 2B 2C 623B IH 2C 623B 41236C
something even flashier would be like 2A 5B 2B 2C 214B dash 2A 5B 623B IH 2C 623B 41236C
for F Nanaya you have either a BnB -> Oki or
BnB for damage
damge wise is gonan just be like 3.6kish or something anyway though