Here is My Team. Should I trade V-mart for Carl Crawford?
No way! Crawford isn't that big an upgrade on your OFs and you will take a big hit at C. Judging by how many top players you accumulated on your team, either it is a small league or the people you are playing with don't know what they are doing. Either way, there should be some high quality OFs on your waiver wire. Top level C are rare so the difference that you will have at that slot with martinez (assuming he breaks out of his slump) will be significant. Molina is unlikely to keep playing at his current level.