The hardest spot to fill on the roster? The No. 5 receiver position behind Julian Edelman, Danny Amendola, Chris Hogan and rookie Malcolm Mitchell.
A case can be made for Keshawn Martin (who signed a contract extension in January), Aaron Dobson (who is healthy), Chris Harper or DeAndre Carter. Or even Nate Washington.
The author didn't really say his opinion on who could emerge in that spot, but did say Carter and Harper can be placed on the practice squad while Dobson and Martin cannot. The author did say Carter is in the Edelman/Amendola mold which could provide some insurance since both are currently hurt.