Here I solved the timeline and the sonic of the past/other dimension. Blue is the main time line green is the classic/different dimension timeline. Put simply sonic of the past experiencing generations nent he could no longer become modern sonic and that caused a timeline split when 3 goes to mania instead of adventure making him from a different dimension instead of the past then mania goes to forces but going back to maina might mean another split in the timeline making one where he does go to forces and one where he doesn't, but that one where he doesn't probably doesn't matter and might not even exist.