Beckum is 6'3" 243, had the most bench press reps among TEs, and ran a 4.6 40 while only being 80% from his broken leg. It's not unrealistic to think that he runs in the low 4.5s when 100%. Not to mention he had 900+ yards the two years before he broke his leg.
Beckum is EXACTLY what we need, and could be had in the 3rd round.