i dont think that will be the case.
you give only the items you once used (the weeker one) and if you even give the chaos archer the sun armor, ther will be others with the same monsters and equipment.
but if you still think that make the creature to strong, the equipment could give the creatures only a part of the properties or you could give the equipment only to the weeker creatures
P.S. you could give it a "makeover" on how you will like it to be