Jimmy Graham: Graham is the best tight end in the NFL but his role is set to change extremely. He is the biggest offensive threat on the Seahawks a run heavy offense. I cannot see Graham's numbers dipping to point of fantasy irrelevance but he may have fewer chances as a large number of plays are going to be dedicated to the run. Any games were Russell Wilson has 3 or more touchdowns it is certain that Jimmy Graham will have caught one of them.
Rob Gronkowski: Gronkowski's fantasy value is largely correlated to Tom Brady, so with the jury out on deflategate we currently have no idea who will be throwing that football come September. If Brady's 4 game suspension holds than he will be scoring a lot less at the beginning of the season. Gronk is a matchup nightmare who is deceptively fast for someone his size. He has a nose for the end zone and works hard to get there. It should be noted that Gronkowski finished last season with the most fantasy points of any NFL tight end.
Delanie Walker: Walker should be Marcus Mariota's security blanket for the next couple of seasons. Expect him to get an uptick in targets when the seasons starts, I doubt Mariota will be throwing hail Mary;s all over the field. Mariota would much rather throw for a first down or on some quick slants so get ready to see Walker involved in the middle of the field. He is also an easy mismatch to exploit for a rookie NFL quarterback.
Julius Thomas: Thomas is now on the Jaguars which may not be great for his professional career but it should be better for his fantasy life. Thomas was in an offense in Denver that essentially did not need him; they liked his production but didn't really need it. Now Thomas is the main weapon for a quarterback looking to make a name for himself. I am sure the Jaguars line can hold up for a few big plays a week to Thomas because it's not like Blake Bortles is going to throw to anyone else.
Jason Witten: Witten has been a reliable fantasy option for years now but his production has decreased with his age. This year should be one of the last big statistical years he has left. The Cowboys are going to run the ball but not nearly as much as last year and Witten is always the primary passing option to move the chains. Romo throwing the ball more this season should mean a better fantasy season for Witten.