1 - Werdum
2 - Velasquez
3 - Aldo
4 - Cruz
5 - Lawler
6 - Rockhold
7 - Weidman
8 - Alvarez
9 - Pettis
10 - Silva
1A - Rousey
Edit: to answer the question, because
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Edit again... to answer among the fighters given
Cain may be the most capable. Maybe. But seeing as he's not all about the belt, and his history of being sidelined, tbe UFC may go with the flow and not bother with a title fight.
Werdum we barely saw, but Stipe is a bad matchup, and is also I question if Werdum has the fight IQ to overcome that.
Silva, only with a Bisping or GSP matchup would I give it a shot...
Aldo is declining, although boxing could give him a boost.
I think Rockhold is most likely. Still elite, not aged or worn like some others.
Most of the others I doubt for various reasons. Aldo with a better game plan may be more likely than some of the others, but his next fight may show if he still can do it.