The other demons in Hell believed that Michael didn't draw a stronger creature because his own energy was rapidly exhausted.
Not to mention, before he stabilized using Ainsley as his medium, Michael would always spend more energy to fight Ainsley's own consciousness.
But that angel was indeed clever and knew that if he killed a lot of demons at once, Ainsley would lose a lot of helpers, and taking advantage of her heart turbulence, it would be easier to seize control over the body.
Ainsley was indeed a bit shaken as she watched more and more familiar demons and evil spirits die under her nose, but even so, the baby strengthened her heart instead.
Then, she kept infecting Michael with more love virus until Michael's whole Consciousness Body was about to turn pink.
A pity. Ainsley still couldn't use her 3D map ability, so she didn't see that Michael's ghost body that overlapped with her figure had turned completely pink.