Allen's progression has been pretty clear and steady. He was awful pre-injury 2018. Last six games in 2018 he was improved. Last game in 2018 against Dolphins was excellent.
2019 he picked up where he left off. Slow steady progress all through the season. Fewer bad plays, but still too many. But upward trajectory was clear.
2020, first four games another jump up-- better than 2019. Then a plateau. Then the last six games a whole other level. If this is his peak, that's fine. But I suspect he'll not reach his peak/prime until 2022-23. But to anyone paying attention, Allen has always had all the goods, brains, hard work, charisma and great athleticism. Takes time for all that to mature.