I read elsewhere that the pilot-passenger says he "dragged the pilot out of his seat".
It is almost impossible to remove a pilot from a 737 seat if incapacitated, even with all the considerable space around. Having flown the Caravan extensively and knowing the houdini -like exercise it is to get a fully mobile person from front seats to cabin I thoroughly doubt this part of the story so for me it casts some doubt on the veracity of other details too.
He did well if he pulled off a flapless landing too, those things are quite reluctant to slow down and float forever landing flap up.