 With three losses in his last five fights, McCullough released by the WEC and would eventually join Tachi Palace Fights, returning to the venue where his career began, and had somewhat of a resurgence.McCullough defeated Isaac de Jesus by first-round TKO on July 9, 2010, at Tachi Palace Fight 5.He then defeated UFC veteran Corey Hill by unanimous decision on September 9, 2010, at Tachi Palace Fight 6.