the last 1 is the most damaging hit of the string. I'm just telling you that the way you play is no different, except you are giving up guaranteed damage for the same mix up. the JiP doesn't really lead into anything different than the stagger state of the last 1. and yes... if you b1,2 i'm going to poke ANYWAY, because the rest of the string is interruptible on block. The only real string I have to fear is 2,1,4 and 2,2,4 on block, because it is not interruptible.
In reality the way you are playing is very reckless and unsafe. b1,2 is 0 on block, and far enough on push that Sub can't d3 or d1, so he will get poked out of any continuing pressure. That is a fact backed up by the frame data.
You are theory fighting me, which doesn't work in any argument. Fact of the matter is, if I land his BnB with b1,2,1 i get roughly 40% damage landing the throw and more if I read them doing anything else. If I read wrong I get the SAME pressure you are describing with MORE damage while being safe.