I think the point Knapp was trying to make was your OP seemed to indicate Suh could have been involved.
As for the idea Wichard was encouraging athletes to finish school...bullsh#t. He's just another greedy bastard agent who sees nothing but $$$ when it comes to some of these athletes. He's well aware that another year in school could find his potential customer injured to the point he's ineligible to play in the NFL costing him millions. Reading the article, IMO, Wichard is trying to cover his a$$ in a big way so any plausible deniability he can toss out there, the better his chances are of coming out of this squeaky clean.
I think Suh's name was only brought up is because both Suh and Austin are defensive tackles and Suh's decision to stay another year in which it paid off in the long run....about $68 million w/ $40 million guaranteed.
As for your 2nd paragraph I could see it both ways but a couple extra million wouldn't hurt either if it meant for that player to stay another year and become a bigger star. If I was an agent knowing that I could get more money if it meant to have that player play one more year in college I would tell him to stay and tell him some other BS stuff to convince him to stay another year.
People will do some greedy stuff when it comes to money and making a extra thousand to a million here and there people will do just about anything.