By Greg Bishop A tit-for-tat exchange between the Seahawks and Vikings in 2006 led the league to outlaw the cost-spiking strategy that’s recently been in the news for other reasons. The football coach saw the headlines and made the connection instantly. How could he not? The same phrase being splashed across the front pages of newspapers across the nation had once been applied to him (Brad Childress), his team (the Vikings) and the NFL. This phrase marked an odd and unexpected connection between a gridiron lifer and Elon Musk, the billionaire entrepreneur, SpaceX founder and Tesla czar. In Apr…