I was speaking about 2 of the 21 top 10 recruits going undrafted. I should have changed the 2 sentences around to be a little more clear. Maybe this will be better for you: :None of those players left after one year. That is specifically what you said, top-10 players to leave after one year.
In the same time frame, UK has had 21 top 10 recruits. 3 of them went undrafted. 16 left after 1 year.