For all the flack he may take for being an "alpha male" almost to a fault, that part of Brock Lesnar's personality is just as responsible for his competitive drive as it is for that gruff persona. That drive is what has Lesnar still looking to compete in the UFC despite a beating in his last fight and multiple times being sidelined with complications due to diverticulitis.
According to coach Rodrigo "Comprido" Medeiros, fans should not expect to see a faded, damaged Lesnar in the Octagon on December 30 (via Graciemag):
"Brock is in great shape. Undergoing surgery was the best decision he could have made. I believe we'll be seeing Brock at full potential for the first time," Comprido told reporter Nalty Junior.
"I'm truly excited about this fight. They're two giants, two monsters on a collision course-I don't think I've ever seen two guys as big and skillful as they are. If Alistair isn't 100%, he'd best not show up, because Brock is super well prepared; I guarantee it," added Comprido.
It's hard to say exactly what to expect in the end. Preparation is important but much of what Lesnar faces is beyond simply preparing. His body and mind have taken some damage over the past year and we won't know for sure until UFC 141 and his bout with Alistair Overeem to know if he truly is "back."