As for Ouro and Argento, maybe because they're half-human half-ogre, it seems like they have grown enough to start some training. I carefully made their training not too intense so it doesn't obstruct their future growth. But I try my best in making the training challenging enough to still make them strong. So here we are, we have the two training for fun, so that they may become accustomed to it since they will be involuntarily training themselves in the future.