Need to drop a Receiver and Pick Up a Tight End for Week 6?

I drafted Bobby Engram and Roy Williams. When Engram went down, I placed him on IR and picked up Desean Jackson. Now that Engram is back I have remove him from IR by either dropping him or putting him on my roster and dropping Roy Williams. On the fence as to who to drop??? Also I need a bye week fill in for Tony Gonzalez at TE. I have Dustin Keller on my bench, but I have been thinking of possibly picking up either Zach Miller or Anthony Fasano instead. All opinions welcome. Thanks in advance.