Belfort hadn't fought in 1.5 years, so it'd be bizarre for him to have been ranked anywhere given that fact; he was not listed on FightMatrix though.
Cote was
#16 at the time on FightMatrix.
If you don't like my source,
you can always make your own thread and search through webarchives yourself.
Henderson hadn't fought at Middleweight in 1.5 years, he wasn't listed at Middleweight as a result.
Belfort hadn't fought at all in 1.5 years, he wasn't listed at all as a result.
Murray was ranked
#15 at the time, and given who was in the top ten I don't see why he'd be ahead of any one of them too.
Leites was ranked
#14 at the time.
Henderson was actually ranked
#5 at Light Heavyweight when he fought Silva.
Belfort wasn't ranked anywhere due to inactivity.
Marquardt was only #10 when Leites defeated him, Leites then moved up to the #13 rank in the next quarter, moved down to #15 in the following quarter, down #17 the next, before moving up to #14 prior to fighting Silva.
I explicitly stated in the OP that the rankings are based on FightMatrix and I'm not going to change that.