In my opinion, I think that paths that only certain characters can go through should be included, but I don't think it needs to be mandatory for them to go that route, know what I'm saying? Like, say there are 3 paths, path A, B, and C. Lets say that Sonic can normally go through path A, so then so can Knuckles and tails. But Sonic can also take path B, and so can knuckles, but tails can't. And Tails can go to path C, where as Sonic or Knuckles can't.
I think characters should have certain optional pathways which can be accessed by using their charabilities.
Also, is there any small possibility that the Lightdash might be brought back? Even as a secret thing? Or unlockable? And while talking about the lightdash, why not Adventure mode completly? It seemed like a pretty cool mode.