A released lion would be a complete sucker, hardly able to feed himself. A cattle lifter for sure.
It's a dangerous beast as not afraid of humans. And humans having a lion closing to us would be fast to dispatch him in "self defense".
Psychically he is not educated and would struggle to normally act with other lions.........that are not kind-hearted at all.

And taking over a pride..........tough for a normal lion, impossible for a sucker.