After checking SR5 core and Street Grimoire in regards to the adept powers gained from mentor spirits. I can't find what happens when an adept gains a mentor spirit after character creation that grants powers that the adept already has.
Example. Adept has Killing Hands and later gains the Shark MS (SR5 p323), which grants free Killing Hands.
Does the adept regain the power points spent on that power to redistribute as they see fit?