Koa Misi, Robert Johnson, David Reed, Matt Asiata, Conroy Black, Shaky Smithson, John Cullen, Mo Lee, Star Lotulelei, John White, etc.
The majority of those players are currently in the NFL or will be drafted into the NFL. The ones that weren't drafted or won't be drafted were immediate contributors to the team. Even you would have to admit that they have had a LOT of success going the JC route. The percentage of JC players that Utah signs that pan out is very high.