I direct you to this neat list of the resources required.
This, to get a human level 5 fighter/rogue. Who could be a poly morphed spy.
Again. Neglible.
No reason not to do it for one's allies.
If you find yourself watching Power Rangers and wonder how some characters got their powers and zords back for an anniversary episode, just assume they were restored off screen. They have 20+ seasons of team geniuses to call on.