I like the concept of this alot, but as far as I see it, at best it's a 50/50. I say this because you have to rely on the opponent letting go of shield before the crash bomb explosion. In order to put this into practice, you'd have to react really fast to that, but what if they keep their shield up, or run away and air dodge the explosion?
Yeah, but with bair I think you gotta MB to CB explosion to bair, or hit them the other way with i. The awesome thing about the MB throw setup is that if they shield MB this could set up for a possible shield break. I'm gonna look into that too actually.
For those wondering about possible shield breaks with crashbomb and metal blades, I have a video.
But once again, this setup requires the opponent to stay in shield, which will almost never happen against a good player. However, if you do land a shield break, it gives you a free infinite no matter what percent they're at, into a free utilt.
By the way, the shield break in this video works on full shields.