Although whiffing the b1 on regular WU never seemed advantageous
I watched your video again your b1 is just whiffing on delayed get up when mine is whiffing on instant stand up
Here's the break down
Forward Cmd Grab +10 as we know and that counts for if the opponent wake up
If opponent just stands up (not delayed) it takes 7 frames before they can press a button and they can't be hit during it
So that makes it 17 frames to stand up
B1 is 9 frames start up and 7 active frames so that makes 16 total frames
Counting the point frame itself and the extra spare that's giving a window of 2 frames of making your b1 whiff so there is no read on late get ups
If I do B1 ex choke and time it right Ex choke will NEVER come out on whiff but only if opponents wake up
When your option select seems to be they wake up and you crush the opponents armour if they don't wake up and stand as soon as they are avualable your B1 Ex choke will still come out but since it's safe it's okay
Mine let's your get big dmg like Ex ball if your execution is on point and not punished on block because it won't be possible
In short I am option selecting the special cancel
Also unlike using D4 B1 will always be consistent on any wake ups atleast 11f start up as to its not possible to do it too early because of its active frames