So this is not a prediction it's just an off-my mind idea for Peter's return, so this goes like this:

So when Mephisto took Peter and MJ's wedding during One More Day, he said it would take away a part of their soul, my idea is that that since Peter is "DEAD", (probably not a shock) he would be reunited with that part of his soul and remember both realities. That's why when he gets back, there would be this part of him that just wants MJ so much more since theoretically he's been married to her.

Weren't Mj and Pete the only two that remembered both realities ?

They remember that peter revealed his identity but not their wedding.

I doubt they'll do that. I doubt they'll ever address the cost to Peter's soul of making a deal with the devil or all the holes in it's his history now. I think they'll just ignore it and any critiscisms about it until people forget it's there. Kinda like neuropathy.

I always felt that the situation that led to OMD was Mephisto's own handy work. He had to create those circumstance that led to the Kingpin putting a contract hit on Peter by making him reveal his identity to the world. Otherwise, why would Peter be stupid enough to reveal his identity to the world anyway when he knows that his enemies would come after him? To me, the real reason why Mephisto wanted to offer a deal to Peter to save his Aunt May's(who wasn't really dying to begin with) was because he needed Peter's soul to unlock a door that leads to a weapon that he could use against the Gods. In my opinion, Peter should never had made a deal with Mephisto to begin with because his gifts comes at a price. I was counting on Peter being dead sooner or later and his soul finally going to Hell as part of Mephisto's plan.

Peter's soul will remain in Hell until it finds a way to escape.

In the Pre-OMD universe, if Peter had turned down Mephisto's offer then it's likely that Mary Jane and Aunt May would have been killed. In addition, Peter Parker would probably be put on trial and sent to jail from a corrupt judicial system and have his spider-powers removed. This would be another of Mephisto's tactics until he gets what he wants.

Then why was the Rhino in Heaven when it was revealed that he's still alive. And why was Silver Sable in Heaven when Madam Web told Peter that she didn't die?

Any of what you just said would have made better story telling than what we got. The only person who was "in-character" in that story line was Aunt May in a coma.

Oh they are alive now? What issue did I miss? I thought they both drowned together.