IMO, you hit the nail on the head. Diamond spent all season looking for some Doo-Wops. Like UConn, Tennessee basketball doesn't work that way; it is a TEAM-based concept (basketball is a team sport, right?). You have to be every bit as willing to be a Supreme as to be Diana Ross, depending on the situation.
Until she learns that lesson she will be mired in mediocrity, showing occasional flashes of brilliance, but never reaching her potential. She'll go to the WNBA, play for a middling team, and struggle with her daemons there, as well.