Ok.
So I think everything works as it is expected to work.
5a>2c
CS2: doesn't work.
CSEX: doesn't work.
CP: does work.
Note that 2a>2c works in CS2 because 2a's untech time is 14. Note that in most cases a level 0 attack has 12 untech time, and a level 1 attack has 14 untech time. I wonder if 5a is +1 in CP? Or if they increased the attack level and decreased the recovery, or decreased the active frames. Also - could be universal change that increases the untech time of level 0 attacks.
5b>3c.
This does work in CSEX, CS2, and CP.
5bb>3c
Doesn't work in CP.
Conclusion: 5bb attack level reduced to 2. If it were because of 3c being slower, 5b>3c wouldn't connect, unless 5b had a level of 4 now, which seems unlikely.
Charge cancels:
Same in CS2 as in CSEX, but if anything they're worse in CSEX than in CS2, though maybe relatively that's not the case. The amount of charge between games is equal cause the CSEX charge cancels were just retaining the charge rate of CS2 but only for charge cancels. Pokes after a charge cancel are all around better in CS2 (5b, 2a). Both were slowed so that makes it harder to use charge cancels. Also the 5c level decrease from 4 to 3 in CSEX. But lots of stuff is worse in CSEX so charge cancels see more use.