This is what high-high potential is for. I've been a huge proponent of recruiting for high-high potential. Some of the guys I've had drafted: #200 Center, #105 PG, no-star international center, #80 SF, #70 SF, #89 SG, #52 C, #90 PF. I just had a completely unranked center lead the nation in scoring and become first team all-american for a big 6 school.
Also, of your examples: Tony Mitchell was the #12 player in the country (rivals), so probably not the best example, the others are good examples. I guess what I'm trying to say, recruiting in WIS is definitely not an exact science and just like in real life, you have to dig deep to find the gems.