Let me first say that I don't love the idea of getting Marbury. That said, if Danny were to do it, it might work out OK. Much like the Bulls with Rodman (or crossing sports, the Pats with guys like Dillon and Moss), the C's do have the veteran leadership to reign him in. Furthermore, at a minimum contract, it wouldn't be a problem for the Celtic brass to simply cut him if he doesn't work out.
Again, I don't love the idea, but it's hard to deny Marbury's talent.