Just when you thought competitive balance in the NBA couldn’t be worse, the two-time defending champion Golden State Warriors swooped in Monday night, stole the thunder from LeBron James’s coronation in Los Angeles and signed DeMarcus Cousins (the best big man still available in free agency) for well below market value. Now, what already felt like the biggest foregone conclusion in sports — yet another Warriors championship — seems even less in doubt, somehow. Doesn’t the NBA have an incredibly complex set of salary-cap rules to prevent this kind of thing from happening?