I never really liked these summoning people from another world when they're still alive. Much prefer if it had (pretty cliche) death of some main characters and they regret something, thus being chosen to go to another world.
Why not just have a few encounters before jumping straight to lvl 123. I mean how the hell could he have lived so long against something that would power level him to that extent. The cooking skills being so universally op is already a stretch, why pile on.
The base-line has been set. We know he's a cook, and has the "Dismantle" ability that does the skinning, draining, and separation of food or what can be considered food.
These 'beings' that made the betting, have no idea how bad they screwed up. If you want an army, you need a cook. Cooks can keep the army fueled up and ready to go.