Rampage, Rashad, Lyoto and Rua should be off limits to him for his next fight.
He should fight Silva or Bader next.
If he wins that fight, he should get either a title shot, or at the very least fight the Lyoto-Rampage loser.
Anyone else at 205 is a joke for him at this point. What else does he need to do? Giving him trash bags over and over again is going to lead to people taking less of an interest in him and his skills will diminish at the same time.
He needs a real test and by real I mean an actual challenge. He is too gifted, too strong and way too good a wrestler to prep him with another 3 or 4 bullshit fights.
You gain experience (valuable experience) by fighting the best and having some wars, not by pounding on subpar fighters that don't deserve to be in the ring with you. As a 23 year old with a 12-0 record, he should be going for it now, not wasting his time. He has taken no damage and experienced virtually no hardship as a professional. Going for it now is only going to help him, not hurt him.