7 star busted defenders

There is something that I don't understand at all, please someone from the Kabam team to enlighten me up - why champions that are unplayable for us as 7 stars or even 6 stars(magic, quake etc), we see as a 7star fully stacked up defenders in side quests, incursions and so on ?
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And they aren't busted defenders: they're busted Attackers.
If the AI starts to shake'n'quake us, or Magik corners you with endless SP2s whilst you're Power Locked, then you can start complaining.
With bigger healthpool, if you don't kill her, she will regen and deal auto damage