Just something I noticed last time watching Warrior (2011): When Brendon gets swapped into Sparta, it’s because Frank's #1 (Marcos Santos) has a knee problem during cardio. The thing I noticed is it’s the very same knee that Brendan strained with a heel hook during sparring a few scenes earlier.
Now it’s sparring and you’re not supposed to hurt each other (even more so before a big tournament) and Brendan having experience would probably know how much pressure is too much (heel hook is notorious for being the cause of pretty terrible knee injuries if applied carelessly) and so one might think that he did it on purpose to get into the Sparta tournament. Doesn’t exactly fit the overall theme of the movie but still…
Or maybe it does if you consider Brendan to be the guy that hurts even those close to him to get what he wants but he didn’t seem that way to me.