It doesn't matter what has done. It's all about what he can do during the length of his new contract.
What is the cumulative effect of being double teamed on the line while being undersized for that position?
DE's get bigger contracts than most other positions because they typically don't last as long. The average career of a DE drafted in the first round in this century is less than 7 seasons and those are the 1st rounders.
Micah Parson could have been the next Lawrence Taylor. Then he would certainly be the best defender in the league. At this point, it wouldn't shock me at all if he began to decline five minutes after signing a new contract. It wouldn't be deliberate, he is slowly being worn down.
Instead of being the next Lawrence Taylor, there is the possibility he will be the next Zeke.