I think they wanted to throw in a little "twist" in the end, although it was somewhat awkward. When my wife and I saw the intro, with both thought it might be a young Denbe (the timeframe was about right), but then the scene switched immediately to the African animal cartel guy, that I'm thinking we were then meant to believe it was him. They save the reveal till the very end - felt a little like bad editing there.
Does anyone else think it was oddly out-of-character for Red to give any kind of rat's ass about any social-political cause at this time in his life? Sure, he might have had some idealism early on in his life, but why would he still care at this point? Is this his own way at trying to hold on to his humanity? Unlikely, considering his statement at the end when he shot Ace, likening them both and placing Denbe as a higher class of individual. In his mind, he's made it clear that he already considers himself a condemned man. Or perhaps it's because of Denbe's personal experience with the cartels that Red rescued him from. Can't really figure out why he cares about anything at this point other than those on his black list.