There is literally, definitively, absolutely, no reason to be dissappointed in Keon Coleman's rookie year.
First of all he got illegally jacked up by Jordan Poyer half way through the season, missing a bunch of time, and likely messing with his WR mechanics because of that forearm injury, and it was timed perfectly with when he was REALLY ascending into the WR1 for this team.
Second of all, he's been able to legally drink for 7 months
Third, he wasn't a high first rounder. He wasn't even a first rounder at all.
Fourth, he's already a borderline elite blocker at WR
Finally, he's flashed plenty of mid first round talent and has shown not only potential to be a real weapon in this league, but has literally actually done it.