The Mystery of the Cannibal - A Song of Ice and Fire - House of the Dragon

Why does the Cannibal eat other dragons? Was the Cannibal really on Dragonstone before the Targaryens? Why did he fly by the funeral of Corlys Velaryon? And is there a theory / series of theories to connect all these ideas? Well of course there is! And the answer may reveal more about the mystery of the dragonbond and dragon lineages...