Actually Iizuka never said "Shadow doesn't have any friends".
What he said is "Shadow is not friends with Sonic."
And about Team Dark, it was Ian Flynn who said "“Team Dark isn’t a thing."
"It’s an out-of-universe brand, apparently. They don’t do mission things together unless the story has them doing it.”
Source :
https://www.youtube.com/watch?v=xvTz9up01Gs
So Flynn got Team Dark back together again?
