Stars aren't made in a vacuum (or at least very rarely are). They need players around them who are at least good enough to compete with the other team.
Keith has the athleticism to compete with Houston, his problem is that he's a Dejon Jarreau type player. A slasher who disrupts the opposing defense, but doesn't shoot well. He needs ball movement and a spread floor to get shots or chaos from TO's or offensive rebounds, which doesn't happen when you don't have good 3-point shooters and you have Vogt inside helping to clog the lane but not rebounding.
DD, MAW and Davenport are good enough athletes. But none of them have great athleticism. MAW and Davenport don't have good enough handles to create their own shot. DD can sometimes bully his way into the lane and create his own shot.
Mason is a below average athlete. For all that he can shoot threes, Houston abused his defense when it mattered. Getting some garbage time buckets made Mason's stat line look good, but his defense was not good. Saunders gets beat a lot on defense as well, and he has the Justin Jenifer problem of even if he plays perfect defense, guys can still just shoot over him because he is so short.
DD, MAW, Davenport and Eason is a good enough group that if you give them some experience and a star player (preferably a center), we'd be in good shape. But that's a lot to ask for by next year. I could see year 4 (if DD took advantage of the free year), us being really good if those 4 stay together. But again, we'd need to add a high quality center (or two). I promise you that Lakhin is not that center.
Mason and Saunders are probably career backups. If this was a NCAA tournament team neither of them would be getting minutes. Lakhin is probably an average center at best, and more likely also a career backup.