Fleener is easily the best TE in this draft. He will probably run a mid 4.6 40. He was the best offensive weapon for his team last year. Both Dwayne Allen and Orson Charles have not had the best predraft workouts. Charles ran a 4.75/4.90 at his pro day and Allen ran in the 4.9 range at the combine. Pretty unremarkable for players that could be picked in late round 1/early round 2.
When I think one dimensional TE - I think Jimmy Graham - an absolute mismatch/receiving threat in the passing game but is not asked to block (probably more due to the offensive scheme than his capabilities).