One theory on why Future joined the Anti-Drake Avengers is that Pluto was pissed when Drake did a joint album with 21 Savage.

This stung because Future had always been Drizzy's main Atlanta homie.

For 21's part, he's remained loyal to Drake even as the rap game -- in particular Savage's frequent collaborator Metro Boomin -- have turned their backs on the Canadian.

Here is Savage in Drake's hometown of Toronto, making it clear that he still stands with The Boy.

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“Aye, Toronto — make some muthaf*cking noise for the one and only Drake,” he said before bringing him out.