Boyce is before M'Benga. His only appearance is in "The Cage", which takes place before SNW.M'Benga to Boyce, not Piper, is the CMO transition that needs to happen at some point.
His daughter does not need a cure, atm. Perhaps there will be ramifications for what he did in "Under the Cloak of War." It took until the next season for Una's heritage to bite her. Perhaps it will be something else.