@goatgetaenjoyer i have an idea of a story for Shadow VS Vegeta (to make the fight make sense). Mephiles and Goku Black have sort of taken over the main sonic universe and have “hired” Shadow to steal the DragonBall (the last one they need).

Shadow reluctantly agrees and goes to fight Vegeta which causes the whole conflict in the first place. (None of this will really be shown, but rather implied, as Shadow won’t be able to tell Vegeta what is really going on, and why he needs the ball).

Just an idea to make the fight be more in character and less out of nowhere. Some tweaking could be required though.