That's why you end in command grab so you can punish forward rolls. You can use b1 to punish rolls after shotel (back up slightly and the timing punishes forward roll, u2, u3).I don't think you have either if thats what you are saying. Its effectively impossible for it to get it to punish a wakeup roll after shotel. You are either too close and the forward roll goes behind you(full punish) or they get to forward roll, block the 2nd hit, and get full punish if you tried to create space. Its effectively impossible to reliably create a setup where you can have the active frames on the 2nd hit of 44 to punish a wakeup roll, without still being too close and having the forward roll go behind you, any amount of backing up means you lose your window.
Its a bad option that will get you killed.
I did more testing and it turns out its very character specific. Some characters easily go behind kollector, some actually do get punished. Well the original point still stands for the characters that do get punished in that its still not scary at all, as he just stands there, goes negative at not too far away, for 1% chip damage. If you wanted to do that, spare change still does it better, and it is in no way shape or form good or scary pressure even on the characters it can punish the forward roll on. You need to play some Geras or Jax or Erron to see what real oki is.
Kollectors oki is not just 44 though. Dash up command grab is real, dash up f1. As I said, I don't think the restand is that strong when you only have f1 and throw to threaten with (if command grab was a high this would be moot, but it isn't so yay a real command grab!). Or rather it's good, but not better IMO