While size is not a prerequisite for blocking ability, size and strength help. So let's look at the size and strength of the guys fighting for the 5 (or 4) at WR and the guys fighting for the 4 TE spots.
|Duncan, Joe Don||TE/FB||6'3"||267||R||Dixie State University||35|
|Thomas, Demaryius||WR||6'3"||229||6||Georgia Tech||?|
|Fowler, Bennie||WR||6'1"||217||1||Michigan State||18|
|Palmer, Nathan||WR||5'11"||198||3||Northern Illinois||13|
|Burse, Isaiah||WR||5'10"||188||2||Fresno State||16|
|Williams, Kyle||WR||5'10"||186||5||Arizona State||11|
|Norwood, Jordan||WR||5'11"||180||6||Penn State||?|
|Sanders, Emmanuel||WR||5'11"||180||6||Southern Methodist||12|
While we have some decent size at TE, none of them are huge by NFL standards. In terms of brute strength, Joe Don Duncan is undoubtably the strongest of the receivers - putting up 35 reps on the bench at the combine. Pound for pound, Casey, Latimer and Caldwell are also very strong. From what I have read about Casey and Daniels, both are at least average blockers. Heuerman while by waiting until 2016 to show off his blocking ability because of his torn ACL.
With the exception of DT and ES, I would expect all of the players from the list above who end up on the 53 man roster to participate in special teams. In the fight for the final two (or one) WR roster spots, an ability to return kicks would be an added bonus, though not a necessity as Bolden will probably begin the season as our kickoff returner. Emmanuel Sanders could be our main punt returner. We might find our punt returner from the group of defensive backs. I don't expect us to keep a player as a dedicated return specialist this year (ala Trindon Holliday). In case you are wondering, Fowler and Taurean Nixon both have a little experience in college as kickoff returners but both were not good at it (Fowler returned 15 kickoffs as a freshman averaging 22 yards per return while Nixon only returned 4 kickoffs averaging 13 yards per return). Josh Snead also returned kickoffs as a freshman at Duke (21 returns averaging 23.6 yards/return).