@
Purpletuce
Standing regrab only works with certain DI. If you DI 135-180°, you can Nair them before standing regrab.
And wow, here I was trying out all kinds of things and it was the port number that mattered. Confirming what aMSa said:
At 0%, Port 2 Sheik is +10 after Dthrow against port 1 Yoshi, but +9 after Dthrow against Port 4 Yoshi.
Notice DamageFlyTop is on frame 23 vs frame 24. Each picture shows Sheik's first actionable frame.
I am not sure that this guarantees a way out yet, but it at least makes certain parts of the chaingrab very hard (ie. 1-frame window for regrab). I will keep looking unless aMSa comes back to blow my mind again.
Edit: I haven't heard of port priority affecting hitlag like this before, but I do know that Game & Watch has some weird port priority shenanigans involving knockback when he gets thrown by certain characters.