Probably the only team that has improved is Orleans. They have a very good coach so I expected them to improve over the course of the season, but I was still shocked when they beat Loogootee.
In my opinion none of the teams are good enough to beat BR if BR plays average (for them) or better.
BR tends to get in foul trouble but are deep enough that isn't a killer. Shooting has been a problem for BR. They have had a couple of games where they didn't make a single jump shot - but still won those games.
I apologize for this rambling answer. A simple answer is that any of the teams except Washington Catholic could beat BR, but it would be a huge huge upset for Shoals, Rivet, or Orleans to do so and a very big upset if Loogootee beat them.