I'm pretty sure B4 being deposited on Kolarus II was done by Shinzon. How else would he have reprogrammed him?
Well ... yes ... unsurprising. But Shinzon had to discover him somewhere first
, himself- before
he could be deposited somewhere - did he not? And that's
the problem. One clone finding another clone, to use as a weapon against his own orginal copy? That's stupid, that's how lazy that is. It's something a student in script-writing would've come up with and gotten a big fat "F" for, certainly the way it's presented here. It's not handled in any kind of a clever way, whatsoever ...