lmao the +++ upgrade.
ok fine, I'm guilty of that...

One thing gluttony does have which you touched on a bit, is the weakness of overwriting existing useful moves with things of much less value, making higher tiers of gluttony a potentially larger loss from an otherwise equal attack, such as any of the tiers in this moveset you've made attacking a hostage/princess and immediately becoming harmless as a result.

Usually the negative impact wouldn't be so extreme, but if you look around the units in the game you start to find that a large number of them can actually cause a lot of harm to gluttony simply from transferring their movesets onto his, and this becomes even more common if you factor in the lack of transferring passives that may build onto that moveset (ex: sylph/snake).

This is a double-edged sword though, because gluttony also avoids taking any negative passives such as virtues, elementals, reaver/merc, fireball, or even soulflare. This means gluttony can become extremely powerful from attacking an otherwise weak/balanced unit, or become extremely weak from attacking an otherwise strong unit.