Hocker is still in school (senior) so he still has to be in Eugene and he probably wanted to stay with Thomas. Notably, all of these other guys just finished up their college careers and probably wanted to give it one last push while in their prime. And since Cole was in Eugene anyways, he probably saw it worthwhile to at least have some people around during workouts, especially since they're his friends. Not ideal for the 6th place finisher in the Olympics but better than nothing. Plus, Thomas does not have a team so he probably said yes and wanted to keep coaching a group he had success with.