The reason for not going 21212 is because the 1 doesn't hit.I also saw that 2xxBF4 but was wondering why it is better than going for 21212 hitconfirm in that cases (he also did frequently). If opponent low profiles it does not matter. On hit 21212 can be comboed too. On block 2xxBF4 options are not that good.
I am new to Erron but learning from Sonicfox's matches - it is fun to watch. Rarely drops unsafe 50/50 but plays strong neutral.
Sweep on block is -1 but has knock back, if the opponent uses an advancing attack that is 10 frames or slower the first (2) will hit then and if you dont hit it, the cancel wont come out, its kinda option select I think? only good vs some chars.