I can't remember who it was, but Belcher brought in a leg lock specialist to train with him for his camp, and pretty much became a leglock specialist himself. Let me try and find it. I can only find an article on BJ Penn.com(uurgh), I read something more in depth around the time, but I can't find it. Basically be brought in Dean Lister and Davi Ramos to drill leglocks with him, starting him from bad positions etc. Dean even ran the camp for a while.
Preparing for Palhares-How Alan Belcher Out Grappled Rousimar Palhares | Bjj Eastern Europe
Preparing for Palhares-How Alan Belcher Out Grappled Rousimar Palhares | Bjj Eastern Europe