And the Packers, Broncos, Saints, Ravens, Seahawks, Steelers, Pats different team building strats have all led to a different team winning the SB dating back to 2009.
It's almost as if each of these ways are viable ways to build a team...meaning no true right or wrong way. You need the right players, some luck, and momentum to repeat.
You could also say there are 31 ways not to build a team each year. Since only one of the draft/develop heavy teams and FA building teams and the heavy spending spree teams win it every year.