If the Lakers were smart, they'd go all out for Posey. He'd be a far better fit at the 3 than anyone they have now. A front court of Odom, Gasol, and Bynum may sound nice, but it lacks the quickness and shooting range to not hurt the Lakers' offense (Kobe is going to have trouble getting to the hoop if all three of them are on the court together). And while Bynum might give them good interior defense, Odom at the 3 also hurts them defensively.
Posey would change all of that. He'd spread the floor, keeping their offense dangerous and would improve them defensively. Hopefully Ainge and Wyc look at the situation, give Posey the contract he wants, and just make sure the contract expires before they look to rebuild. As long as they do that, they should be in good shape.