I think there's something that must be stressed (everybody is aware that resigning Allen won't hurt our ability to sign new players):
If we need to spend the MLE and the bi-annual exception to resign Posey and House (or similar players), then we must keep Tony Allen.
If we don't, please take in consideration that we're already paying luxury tax, so for every contract over the cap they have to pay the double. In that case, we would have:
Starting Five + Posey, House, Scal, Powe, BBD, Pruitt, MLE player, LLE Player, Rookie, Veteran Ring Chaser. To add Tony Allen, we would need to cut one of these; and we'd probably be the most expensive franchise in the NBA.
-----------------
I think this a better and more realistic question:
Would you rather be able spend the entire MLE (aprox. $5.8M) in the FA market or spend $2.7M resigning Allen and than spend only half of the MLE on a free-agent?