You don't trust Taj and Asik ... yet you want guys like Kwame Brown or Thabeet?
Taj & Boozer can and will play together. Taj can play on most of the guys Noah can play on, and the bigger guys (really only Shaq, Howard and Bynum) are guys you'd probably consider having Boozer guard even if Noah was there.
Again, I'm not saying we need to replace Taj or Asik...I'm saying w/ Noah out, we need DEPTH. I'd love someone that could join the rotation of Boozer, Noah, Taj and Asik. I want someone besides Kurt Thomas and Brian Scalabrine...
And, on any team w/ a legit big, playing Taj and Boozer at the same time is not going to be pretty...their offense may neutralize the situation if Taj is having a good shooting night, but it's not something to depend on.
To reitterate, I don't think we need to get someone to play in front of Taj and Asik...but we need someone that can at least contribute BEHIND them. If Asik gets in foul trouble and Boozer gets hurt...Taj and Thomas/Scal are in the game. That's going to be chalked up as a loss.