The project label is overblown. There are very few QBs in the college game drafted highly that don't have things to work on. Allen got by in college with his arm strength, which led to some sloppy footwork and throwing habits.
You draft a young QB, surround him with players who can get him feeling comfortable, and work on whatever faults they have. We just haven't done step 2 yet.
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He got the win. Ergo, played well enough to win. See Bills v Titans 10/7/18 for more info.