Generally speaking, it's whatever rises to the top and gets a lot of comments.
Some teams (South Carolina and Notre Dame, for example) have their own threads because they are of greater interest to UConn fans.
Some conferences have their own threads because there's a critical mass of us who are interested in all conference games (us PAC-12 fans
@Plebe likes to rag on!)
And then there's grab-bag notable games. (i.e., Ayoka Lee's monster game, etc.)
And when in doubt, weekly preview thread captures everything without a more specific thread.
Yes, there's definitely cross-thread bleed, but I think it generally works alright as long as there aren't a lot of different threads about the same team (see my comment in the most recently commented on Tennessee thread). And since this area exists at the indulgence of
UConn fan mods, we just kind of need to self-police any excesses.