I would do it given your roster configuration.
Your SP is very deep. You could absorb losing Lester, and Sanchez is better than most people give him credit for, cleary not on Lester's level, but a solid 2-3 type SP.
You've got Carlos Lee to insert into the IF postion when Moreland is facing LHP.
Kemp is a monster and strengthens a so-so OF.
The only downside I see is Bourjos is your only steals guy. You can use your deep SP and trade for that.
Please help with mine. viewtopic.php?t=442432