So in your own example, you thought Bob Stoops recruited the players he won the title with in his second year?
Of course recruiting matters - I'm even arguing that talented players is the most important factor. But being a good recruiter is not the same as being a good coach. And even in recruiting, the coach is not the only factor, as parents, friends, location, fans, academics, etc. all factor into whether a player is convinced to play for a coach. And in some cases, like Stoops and his title or Pelini with Suh, other circumstances (e.g. the coaching changes) ended up being bigger factors than the coach's recruiting prowess.