This is a curiosity question.
Some time ago, late Grothendieck's manuscripts have been uploaded, with consent from Grothendieck's family, for the community to consult.
They can be found here, following a link on the IHES webpage dedicated to Grothendieck (https://www.ihes.fr/en/tag/grothendieck/)
https://grothendieck.umontpellier.fr
Has anybody read through some part of them, and found anything interesting so far?