Honestly, I question how much Cal even has to play in the gray areas to get his players anymore. At this point with the one and done rule, everyone knows these players are not there to get an education. They are there to bide their time until they can be drafted into the NBA. Cal has such a reputation for helping them to just that and has had such a run of success that his job is practically done for him, especially when he can have his former players who are successful talk about how they really love him.
All he should really have to do now is relatively simple: go into their homes, get to know them a bit, talk about how his goal is to get them to the league as fast as possible so they can achieve their true potential, point to his many successes in that regard, and then go make another Final Four. It's a program that nearly recruits itself, and he is going to win more than enough recruiting battles for 5 star players that way to fill a roster, even when some of them ultimately choose other paths.
Honestly, that's just sort of how the game is played these days with the one and done rule. I'd be fine seeing Illinois ultimately reach the point where we are a revolving door for those one and done types.