It is not correct to say recruits do not want to play for Underwood.
It is fair to say kids in general tend to seek immediate gratification, would prefer to get something for nothing, tend to overestimate themselves, don't like to be scolded -- especially in front of others, and so on. A good part of coaching is helping them get past that and grow up. Overprotective helicopter parents don't help.
I get the impression it may also be fair to say Underwood has a mom problem. Moms played a big role in the defections of Griffin, Miller, and Epps. Griffin's dad was actually pro-Underwood. I heard his mom despised BU. Ditto Epps's mom.
A few years ago, they had a couple big kids and their dads ready to commit. Then moms stepped in and put their feet down. One of the prospects turned down an Illinois scholarship to be a PWO elsewhere.
Edit: while Gibbs-Lawhorn's mom reportedly has issues, she apparently is expected to be supportive.