I agree, it could make for an interesting story if he'd taken it. I'd definitely read that (and I'll put it up in my story idea file to see if it sparks anything). Though as you say, thinking that he'd killed Muldoon does play a similar narrative role, and I do think killing Muldoon out of anger/vengeance/grief is a more plausible thing for Bob to do than taking bribes out of greed.

Talking about things that "double up" narratively, it is kind of weird that Bob was betrayed by two of his close associates: Gerard and Muldoon. (And hmm, bghost wrote a story where they'd actually been working together, which makes it less of a coincidence.)