If you want the best combination of size, speed, and physicality then Florida St (WR) Kelvin Benjamin is intriguing. He is 6-5 235 lbs, he is only a red-shirt sophomore and has been a bit disappointing so far this year (one of the games I watched of him this year coming out of the huddle he had to ask his freshman QB where to line up). But, if he were to declare he would be available late in the 1st due to his minimal production and maybe maturity issues.
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Someone on here mentioned Penn St Allen Robinson, who has a good comination of size and speed (6-3 210 lbs). Late 1st or 2nd round prospect.
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OR, if you want to go ultra athletic TE that we could just flex out wide most of the time, like Rams TE Jared Cook, then here are a couple of TE's that are freak athletes.
UNC TE Eric Ebron 6-4 245 lbs, is only a junior but is a 1st round athlete. Great speed for his size and very good body control.
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And of course Oregon TE Colt Lyerla 6-5 250 lbs, is only a junior who is currently in the new head coach's dog house. Freak athlete, who is ultra competive and very physical with the ball in his hands. Lines up all over the field. He needs to go to the right team that can coddle him a bit, and the Seahawks are a very secure tight team that would be his best landing spot in the NFL.
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Small school mini playmaker is Kent St Dri Archer. He is only 5-8 178 lbs, but he is a playmaking stud. He could be compared to KC do everything Dexter McLuster or Rams WR Tavon Austin. Archer would instantly be the fastest player on our roster, yes faster than Harvin.
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There are a handful of other mid-round prospects that I like, but I don't know how much a mid-round WR would be able to contribute on our team next year.