Stéphane Bigham (Eastern Orthodox) argues that the Son of Man and Ancient of Days is the same person (premortal Jesus) in Daniel 7.
Stéphane Bigham, "Interpreting the Ancient of Days?," Academia.edu, accessed September 17, 2022
[Stéphane Bigham (Eastern Orthodox scholar and priest) argues that the "Son of Man" and "Ancient of Days" of Daniel 7 are two manifestations/representations of the same person; identifies this person with the premortal Jesus]