Let's for a moment assume that Marbury does not get bought out of his contract; or he doesn't get bought out before the March 1st deadline.
The C's then rightfully use one of their open two roster spots for a big (say Joe Smith or Mikki Moore).
Rahter than "settle" for a PG that arguably is not an upgrade over either House or Pruitt, how about another wing that is a proven scorer for the 2nd unit based upon the premise that TA might not return in time for the playoffs and even if he does, he's never been a what we would all consider a a "proven scorer".
Bonzi Wells, on the other hand, has in the past fit that description. And he has also demonstrated a post up game that gave Kobe Bryant absolutes fits. In fact, there were stretches where Bonzi completely owned Kobe mano a mano in iso post up situations. It would also allow two wing scorers to always be on the court when either Pierce or Ray Ray is on the bench.