He beat thiago silva and shogun to get the title fight, had a very close match with the champ completely beating him up in the process. And followed that with a good win over manuwa. Enough to deserve a rematch.
Absolutely. He also had some quality wins before then too (like Hamill), and he's one of only two men in total to ever finish Matt Hamill.
If DC wins Jones gets the instant rematch which puts these two guys in Limbo.
Since the UFC wants to keep challengers coming (and LHW doesnt have much in the way of new blood) I see them fighting lesser talents or guys who don't seem to improve in the meantime. AJ/Glover for instance.