Randon thoughts:
I put alot of stock in Mayock's projections, his track record at identifying talent is very strong. Thus, reservations I have about Ayers are a muted because of Mayock's belief in him.
It's important to remember that while Ayers sack numbers are not strong, he did have 15.5 tackles for a loss. which is a strong reflection that he is able to get pressure.
Just a note though- that you bring up Tuck and Umenyiora, they were much more productive college players.
Tuck had 13.5 sacks as a junior and Umenyiora had 16 in his final college season.
Obviously a bonus with Ayers is, like Tuck, he will be able to be moved inside on passing downs-while the smallish ends/linebackers like Brown and Maybin can't provide that versatility.