The biggest Sixers concerns from a disappointing 1-3 start

Despite walking away with the coveted "Who won the offseason?" title this summer, the Sixers have gotten off to a nightmare start. Two of their three stars haven't played, their offense looks like crap, and they've lost to two of the expected worst teams in the league. Plus, they let Doc Rivers and Tobias Harris both get revenge on their home floor. What kind of sick world are we living in?
Coming out of that opening stretch, basically everything is a concern to me. Let's hit a few key issues.
Health. Duh.
I mean seriously, where else would you even begin?
There were a lot of people who came into this year with optimism for the 4-12ish guys on the roster. The belief was that they'd raised t...