Well, most of the people under him can do more than just 3 chapters of being useful and then being a dead weight for the rest of the game. You're right as it doesn't hurt his part 1 effectiveness, but if anything, he should be used as a last resort, or just to weaken enemies to feed Nolan, Volug, Micaiah, Aran, and other useful units. And again, it's only for 3 chapters. I think he should be a lot lower since albeit 3 chapters which he doesn't really make it a ton easier, he's useless. I think he and Vika deserve to be in the worst 10.
If anything he's useful for is Celerity. That's like, it. But that doesn't make him as a character useful.