No, I mean the original occupant of the cell was a women, He could have been a captured person from the wasteland. I mean the other mercenary the one with the name in the cell down from Fawkes was captured and is going to be dipped in FEV. Until u intervene the mercenary is hostile to u so no praise for saving him. Back to Fawkes, the person Fawkes was is dead in a rhetorical sense. A new being thriving on the sole principle that Buddhism can protect the mind from reverting into a monster. Of course that example was provided by Uncle Leo, the only other friendly super mutant in the game. Leo is a devout Buddhist who I have only ran into once in the game. Buddhists have great mental control which would explain why he didn't change. Fawkes must have been extremely intelligent to seal of his own mind, hence he has no memory from before.