Internal consistency also demands that a creature - be it PC, NPC, monster, whatever - is what it is no matter the situation or who/what it is currently dealikng with and is defined by its stats.
I think enemies using or often even attempting the same moves when they are completely outclassed is less realistic and less genre supported and I prefer simplifications like minion to the complexity of adding desperation moves for outclassed enemies (which leave them taking much more damage).
Outclassed Enemy : Desperation Template.
A monster/npcs facing enemies who are 5 levels higher are always treated as bloodied for effects. Most are being influenced to even fight this adversary
While a few overconfident outclassed enemies are not treated as bloodied till they miss with what they see as their most assured attack.
Aggressive Desperation Stance
effect till the end of your next turn increase your attacks to hit by +5,
however but you may only perform your most basic attack powers. Attacks against you will delivered 2x the normal damage.
Desperation Defense Stance till the end of your next turn increase your defenses by +5, but if you are hit anyway the enemy doubles the damage they deal.
Special: Both stances may and usually are used in unison and attacks against the creature deliver 4 times the normal damage.
One might need or want more rules like restrictions on some other special abilities making them more complicated mechanically and but basically they would be more likely to just fail scaled outright on adversary competence.
Yeh I would rather skip that and use that premade ogre minion when he is fighting high level characters and an ogre standard at medium levels and an ogre elite at low levels.
Or for the Epic case make them a Squadron of Conscripted Ogres when the individuals are truly outclassed but able to fight in a team fashion with some form of powerful influence making them fight and a leader coordinating there fighting. Basically giving them effectively joint hit point pool.
It really is just abstraction....