Oh wow, I'm assuming this is Crimson Flowers, and I'm assuming you didn't recruit Alois, haha Actually, I hate how there's real zero indication that he's all of a sudden recruitable now after Jeralt dies... he's so missable
Yeah, that's the fun replayability of Three Houses! You can just pick units that you specifically wanna use for a single run and just invest all your resources in em to make them killing machines! That's pretty much how I got about a 1000 hours into the game haha