He's got really good size for a tight end, but he's not really explosive off the line or all that fast in the open field. A lot of his big plays came from blown coverages or simply being bigger than the man trying to defend him.. He showed some decent blocking ability.
His high school stats were just so-so, 28 catches for 487 yards and 2 TDs as a senior.
Maybe after his mission, they're planning on bulking him up to be a tackle? Even tight ends that are only moderately athletic can end up being above average athletes as tackles.