How do you know that?? 
Here, check out this thread.
http://www.getbig.com/boards/index.php?topic=180241.0I got this from another forum. But it pretty much sums up this fixed fight up.
1. The first uppercut that everyone thought "rocked" Bo, hit him in the armpit. His shoulder was fine and no injuries have been reported.
2. The next punch hit him in the upper chest, Kimbos upper forearm hit Bo in the head.
3. The elbow that everyone said put him on the floor grazed his head. If you look at the GIF you can see his head barely even flinches when he is hit. It does not jerk towards the side or forwards. If a hard elbow like that really hit flush the persons head would bounce around a bit or at least jerk towards the oposite direction from the impact.
4. You can also see he put up no defense and did not try to protect himself from the eblow. Kimbo had all day to set it up.
5. Once the elbow landed Bo then dived on the matt and started tapping.
6. Bo was then hit in the back of the head as Kimbo pounced on him causing his face to bounce off the mat and put a red mark on his head. (not really Kimbos fault, he was following up).
7. Bo was not rocked. He had no cuts on him. He had almost no bruising. He was not injured.
Bo Cantrell simply did not want to be in there. He took the fight for the payday and probably knew himself he was going to throw the fight so he could get out as soon as possible. This is not Kimbos fault. If anything it cheats Kimbo from really proving himself. However all of the fanboys who say Kimbo is a monster and could knock out anyone in the HW division need to really shut up. Kimbo still has a lot to prove. It's a shame Bo went out like such a bitch. Kimbo is not "legit" yet. Hopefully they put him in there with Silva so we can see a good fight.
edit in: Oh and about the elbow.
If the Elbow landed flush on the side of his head to do enough damange to put him down, he would have at least a bruise. The side of Bo's head was not even red let alone bruised. Sorry but if you really get eblowed in the head by a 240 pound man, you will show visible damage from it.
