Would love some opinions on a trade offer?

I have been offered Antonio Gates for LT? It is a PPR League and TEs get more points per reception then WRs do. My current TEs are Cooley and Keller. And my current RBs are Forte, Bradshaw, LT, Ryan Matthews, Benjarvis Green Ellis. Is the upgrade at TE worth the loss of LT? Is this the time to sell LT high? Is Gates injury a major concern? Advice appreciated...