Fedor has beaten people with much better grappling pedigrees than GG,
and I think Maia is a tough fight for anybody, but he is just too small to beat Fedor.
I mean, the guy tools on huge HW's, the odds an average sized MW would be able to do much are slim.
That being said, Maia does have incredible BJJ, but I just don't see it,
I mean, Fedor has worked with the best in the world on his BJJ (Rickson, etc..)