About your shadow is future sonic au, maybe Eggman accidentally killed his teammates because they took the hit for him? It would explain why this shadow seems to consider friendship a weakness, all his friends died because they were friends with him.
That would make sense, though. It would also explain why Shadow is constantly glaring a hole through Eggman in that one episode (which would of course be ācanonā to this AU)ābecause heās developed a burning hatred for him ever since that day. But at the same time, heāll do just about anything to achieve his goal, even if it means teaming up with his sworn enemyā¦
ā¦though of course, as we know, that didnāt work out for him; he likely developed a hatred for selfies as well after that. š