We're all going to judge the team by results, but it's possible (probable) that the staff sees things we don't. They may have believed this was a reasonable fallback plan and don't have the same questions we have from the outside because they know they're guys better than anyone.
Lot of reasons to question it. In fact, I'd say more questions than answers. Teams that contend for the title usually have minor question marks, and this one's a pretty big one.
I kind of disagree with your first statement. I think it was the chemistry and buy-in that sunk the team, not the point guard play. I see a lot of criticism of Epps, and for sure he had some issues and was a true freshman, but if I'm painting with a broad brush, it was attitude and buy-in that made the team's arc go from dark horse title contender, to rolling over down the stretch.
I'm not as concerned as most, but I'm like that most seasons. Not sure if this team can get to the second weekend, but willing to see it play out, and as long as they're playing hard and getting better, I'll probably enjoy the season.