Ok, lets see:

The Knicks are experimenting on Lee at SF, thus saying they will trade TT someday soon. SF would be Ariza and Lee, which may not be bad but we would still need a more solid SF. Remember Ariza is coming to his 2nd year, and even with Lee's great play, we can't have high expectations about him, at least not now.

The Knicks have too many players to play PF. It seems like Frye may be best suited at PF, though Im sure they will use him at C for many minutes. Trading Sweetney because we have Lee doesn't makes sense because one already has NBA experience and is a great post player, the other may be an SF for us. We also have Rose, JYD and Mo T.

Agree, keep Rose or JYD because they are experienced and good role players. Mo T isn't great defensively, but its a good option for the low post, so he may have been brought in to replace Sweetney. So we have to trade someone, preferibly two, between Rose, JYD, Mo T or Sweetney, and the best for us would be to get a prospect SF and a prospect C or backup C...

We need to get rid of some PF's...

rofl.