I made a post earlier about how the Neo Geo was what created Newgrounds and another fun fact is that the creator of Newgrounds said that Gunstar Heroes was the “game that made me want to make games” which I think we can say is pretty damn important too. Point is, don’t discount some old games as “neat but not that historically significant” cuz that almost never tells the full story.
Some recent Sega games that have crossover content do have a bit more for Sonic than for the other two, though, such as Super Monkey Ball Banana Mania and Samba de Amigo Party Central.