I think it is because he showed some good skill while in the octagon. If it was someone that sucked real bad he prob would have told him to go home. Plus this makes for good ratings, it's only the 3rd episode, there could be more to come!
This is exactly right. However, after rushing the dude in the octagon at the end I think he might be leaving regardless...
Everybody good, plenty of slaves for my robot colony?