I would not have done what he did. I think it was stupid to put himself in a position to do what he did. I've acknowledged that he probably broke the law just by standing there.
But, having said that, I don't think each encounter was as cut and dry as you do. Did he forfeit his right to self defense by standing there violating the law? Maybe. But maybe not.
I have acknowledged there are facts that help your side, and there are facts that help his side (not my side). You are posting here solely as a politician, not as a lawyer.
You asked, "How many rounds were fired at Rittenhouse?" I don't know. In the first contact, one, according to the witness...the guy who ended up giving aid to the guy Rittenhouse shot, while Rittenhouse dialed 911 for his shooting victim.
You asked, "How many bullet casings recovered from shooting scene that were fired from other firearms?" Who knows. Maybe you should wait to find that out before committing. If none, maybe revolvers were used.
You said, "You might want to confirm the existence of such evidence before committing to a justification defense." Sounds like a good strategy for me. How about you do that before committing to a prosecution strategy?