Thanks.A thread on it https://testyourmight.com/threads/kollector-oki-os.71098/ @Zer0_h0ur @Parasurama
I rarely use b1 now that S4 has a string. But it's a good safe check in the corner post db3/dbf3/throw if you dash back. The regular setup of 44 won't punish forward rolls. You can also do the full string which is an ok punish if you don't have bar. But again, 443 is generally the better punish, has a bigger chance of catching people jumping on wakeup and gives you a big combo.
I kept my fingers crossed heading into last weekend's tournament I'd see some functional usage of B1, as on paper it sounds amazing, long reach, a mid, kollector's hurtbox is very far back, cancellable, but I never saw Rebel use it and I saw sonic use it seemingly on accident once lol.
Sucks. It's a mid...i mean it can't be THAT bad?....shrug