This could be a case of conflating two issues.
Some people reasonably think that after a long layoff and leaving USADA, a fighter shouldn't be ranked. That's different than saying a fighter can't beat anyone in the top 100.
I think he's
both.
- Some fans think he'll find the magic touch of 2014 again - they're overrating him.
- Other fans think he "sucks" - they're underrating him.
UFC Rankings lists the top 16 in each division. I personally think he can beat quite a few LW's on that list, and maybe even several WW's. But that's a meaningless sentiment because his days of climbing the ladder are over. He's simply a money fight guy now.
Needless to say, if he loses to Chandler some folks will say it proves nothing since he's top 5 practically himself - and if he beats Chandler some folks will say it proves nothing because Chandler shouldn't even be top 10 with his recent losses. That's just a 'welcome to sherdog' moment right there.