He'd definitely be a top 10 HW.
Sure, Cormier and Cain and JDS would probably beat him but those are three guys, not 7.
He's beat Big Nog(they wouldn't fight but still).....He'd beat Travis freaking Brown, he'd kill Bigfoot and Nelson as well as Struve....etc.
Also Anderson is nowhere near 230lbs...he's around 220 ish when hes completely fat and out of shape.
He's around 210 when he fights at LHW and would be fighting at HW at around the same weight.