I get what you're saying, but you have to take it case by case. My sense is, the issue with Dean is that he was just very raw and un-coached, or poorly coached, when he got to us. Rumph didn't have much time with him. He seemed athletic enough, just didn't have enough time here to figure out what he was doing out on that field.
I'm sure there are some good technical coaches out there at the Juco level. If we can find guys with reasonable physical tools that have been well-coached... well, you just never know, but there have been talented players come out of Juco. You have to scout and recruit that level, period.
IDGAF if they're an Eskimo, a Juco, Russian, Polynesian, or Australian. ****, if he can get the ball in the end zone or take it away from the other team, I'll root for Kim Jong Un. If they can help you win, bring them in.