Bellator returns for its second show of the year on Friday night, with its Season 6 middleweight tournament getting underway. The planned main event — Thiago Santos vs. Eric Prindle to complete Bellator’s Season 5 heavyweight tournament — has been pushed back a week, but that’s just as well: The middleweight action is going to be better than that heavyweight fight. What: Bellator 61 When: Friday, the MTV2-televised card begins at 8 p.m. Eastern Where: Horseshoe Riverdome, Bossier City, Louisi…