You can infer the Camazotz duel in the battle (why Deino Arc didn't see us beating Daybit after their battle, and how Camazotz got his blood on his claws, he drank it). The deino stuff from the manga. He's fast enough to dodge a projectile from Koyan, who is supposely the "goddess of weapontry" powered up by two Masters before he starts the communication. Do you think that's normal? A normal Servant would have been killed, and Daybit isn't a Servant.
The resurrection thing is from Kadoc's and Kirschtaria's statements. Him having U Olga'S heart as his own is in the story too. As well all the other stuff.
Marisbury wanted information of the universe and clarified to Daybit he doesn't need to be so descriptive of the components, only the shape, so he gave him that info. He gave Marisbury a map of creation, and now he is feeling rueful about it. He
is connected to the Dark Star that's as old or older than the Big Bang. That's why he 'resets'. Nasu clarified (yes this was in the stream) he works on a cosmic clock due to the Dark Star connection, so doesn't matter the texture perception of time, hour and day. Also it's his willpower that keeps him from saving 5 minutes (we found this out from his upcoming shop CE), so that's his little "human" (or close) will vs what he's programmed to do. While there's no "hard" lore, we can guess from the conditions of the angelic relic activation (no deaths in 24 hours in a range) and how it holds "malice" toward civilization is that it values "innocence." That's probably why the boy was restored, not the father, and why they reset him so he would not be "sullied." That's my speculation, mind you based on what we know of the artifact.
Again, I wonder why did you shrug off he could tolerate a heart that's enough to power up ORT awake like it's absolutely nothing? Tez didn't want to "touch that thing" on his own words.
The heart and organ compatibility can kill you irl with wrong blood type and stuff like that yet Daybit functioned with Beast VII stellar heart like it's normal.
Plus all the comparison of him as a person-shaped astromonical supervoid. That's probably why he put "Void" in his name.