Alternately, they could instead provide some sort of buff for the group or for their master.Perhaps they could include a new 'tier' of summons once your caster level reaches 21+. Same mobs as MS-9, but their level is cranked up to match yours. That way your summons would still be useful, rather than being a waste of a spell slot in epics.
Pretty sad that a random wolf out in king's forest can tear a hezrou apart in seconds.