What evidence do we have that Simmons is a headcase? I'm serious. I don't know enough about him. I know he got into some heated verbal spats early in the playoffs, but a lot of young players do during their first playoff run.
Growth is THE common denominator of the NBA elites. Jordan wouldn't pass the first 5 years of his career. Lebron quit during his first playoff run when the Cavs were overmatched (by the Celtics?).
I don't like Simmons, but I don't dislike him either. He was a beast in a few playoff games last year and disappeared in others. Fairly typical for an NBA young'un who can't shoot his way out of a slump. I think he needs to improve defensively, however, and I am certainly not penciling him into the HOF yet. Nor Embiid. Embiid screams Bill Walton to me.