I dunno how he's over rated. He lost to Fitch when Fitch was about the most motivated Fitch we have ever seen. And back then Fitch was a tough fight for anyone in the division.
Granted I can't remember the other one he lost to Kim, but Im thinking Silva is going to prove his worth against brown.
Brown for me is an average fighter with a huge heart, work ethic and motivation to succeed. But I think his skills are going to get found out against silva!