Patriarch Gennadius crowned Mehmet II emperor of the romans and mehmet made it his first title, does this means the ottoman empire was the official heir of the byzantine empire ?

by RutilantBoss

And if this is technically correct does this means the byzantine empire technically fell in 1921 because ottomans technically "usurped" it ? It's a bit confusing honestly.

DuceGiharm

follow up, why tf is a byzantine patriarch crowning a Muslim turk?