I think Alito originally had the majority opinion; but lost it because Breyer, Sotomayor, and Kagan switched their votes to get a narrower decision. I bet there will be leaks from Kavanaugh or Virginia Thomas.
There is no reason to think that. From his opinion it is very clear that he tried to win the court over to overturn
Smith but Barrett (joined by Kav) was clear herself in her opinion that while she doesn't like
Smith either this wasn't the case to address it on. Alito only had 3 votes. He was never getting the majority.