Size is an advantage in this game, and Beto is pretty small. You should change him to the LW weight class. Even then he'll be @ a disadvantage vs heavier fighters in the same weight class. The best thing you can do is to pick the one style that you like the most and train all of the fighters in your camp to that style. It's too hard to train a bunch of styles that don't share the same stats.
Your fighter uses only one style at a time. It is generally thought that if your fighter loses a round they will switch to their secondary the following round. All fighters have a set of stats that vary from fighter to fighter. These stats are not visible to us, and there are no ways to improve these stats. We call them hidden stats. It is believed that one of these hidden stats is "intelligence" which effects if/when your fighter switches to their secondary.
HumbleFcknGentlemen