Well, personally never eaten anything by jabbing after IBing 236a online or offline and have been hit out of everything including wolf cancel by others hitting jab after IB. (Doesn't even need IB to hit me out of wolf cancel normally.) Now, without official frame data I can't explicitly prove this, but Sparks puts 236a at +2 which means -3 on IB. Tsubaki could technically even 5b and beat jab or throw (his fastest options) out with perfect timing. Without attack level I couldn't give you SD on wolf canceling, but if people can punish it without IB I highly doubt it's safe with IB.