The current chapter is destroying my head (like Quirrel's humming) - Bones's story is consistent with some of Quirrel, but has so many problems with other stuff.

But OK, we can assume that Bones is telling the truth 100% about the past person, even if Quirrel is not him or related to him, and speculate who it is. She specifies he's Noble, so we don't have a lot of canon characters to go through. I initially thought it was Regulus Black since it fit the Noble Houses last scion disappeared during the wizarding war.

And then I remembered a year was cited. He was born in 1926.

http://harrypotter.wikia.com/wiki/1926

1926: Tom Riddle Sr. abandons his pregnant wife Merope Gaunt, who dies in childbirth at the end of the year.[4]

Oh shit! House Gaunt, last scion (mother dead, uncle dead in Azkaban), disappeared during the Wizarding War... But the story gets strange since he disappears long before visiting Harry. Quirrel suggested playing a double-game to Harry, so this suggests Voldemort/Riddle was also a double-game - but why stop before 'a key vote'? Why return as Quirrel? Why the cataplexy (which made sense if he was Regulus Black, injured/cursed destroying the locket Horcrux, but not for the hero Riddle returned)? Does Dumbledore know? For that matter, has anyone figured out Riddle=Voldemort with this massive departure from canon? etc.

EDIT: Apparently this is on the wrong track entirely, as Eliezer has wiped the birth-year. Back to the starting point...

I noticed a typo:

"The old wizard nodded, but his eyes still seemed distant, fixed only on the road head."

Road head is a little bit different from road ahead.