Theory about Sonic 4(Spoilers for Sonic 3)

So,the fact that Eggman died at the end means maybe Metal Sonic will be the main vilain of Sonic 4 will be Metal Sonic but the fact that there is multiple Metal Sonic could mean that there is a civilisation of Metal Sonic and their leader is Neo Metal Sonic What his origins?i don't know,i think that's possible that Metal Sonic was a plan of Eggman when in case he died,so we have one Metal Sonic who copied Eggman's intelligence and he created clones of himself and after that hé turned himself to Neo Metal Sonic,and now Néo Métal Sonic tries to return to the past to save his creator, Dr Eggman,so in Sonic 4 Sonic and Amy will discover the "Metal Sonic civilisation"and they need to stop Metal Sonic from saving Dr Robotnik And also maybe Néo Métal Sonic is from the future after Sonic's Death and he controls the entire world That's my theory of Sonic 4,i think this will be a mix of Sonic CD and Sonic Heroes