So why do you guys think Finn didn’t know Poe Dameron survived? Wouldn’t there have been footprints in the sand that he ran away in? Wasn’t that robot with him? Couldn’t it have told Finn that he survived and ran away?
Robot?
Also BB-8 wasn’t even there. They were separated several scenes earlier.
And I don’t think Finn stopped to search for footprints after he saw the TIE-fighter sink and explode.
(Both the sinking sand and the explosion may have hidden any footprints nearby.)