Probably for the best. Pretty sure the unique item for the judge pathway “the brass book” has been corrupted in some way. It’s been a minute since I read lord of mysteries.
Ch 2 Chapter 2: The Hall of Stars, the Lamp Genie, and the Fallen Mother Goddess
Sakazuki, given a moment's respite, gasped for breath. He was no stranger to battles of speed, having sparred countless times with Borsalino, a speed demon whose devil fruit granted him the speed of light.
The fan fictions I have found have all been about being a part of Rias Gremory peerage and not Sona so interesting to hear it is more common than I think. Will have to look into that more
If you are planning to go the reincarnated devil route I would prefer he join Sona for the simple reason I rarely see a story go that route. Like the story!