They can go ahead and use the word All-star since unless someone puts a copywrite on the word (some people do this) it can be used by anyone. So Nintendo having used it prior doesn't mean anything. There's other games that have done this as well.
"Exit the stage. Your act is over." - Vergil
"Come on, come on, come on, come on, come on! Now die!" - Albedo
Also they got battle Royale from this
Omar - "what are you guys doing? Why did you get rid of crash!"
Game devs - "we wanted to put in evil Cole so we had to get rid of everyone else the fans wanted"
Omar- "Oh nice, good idea. I didn't think of that"