With eight teams left, the carousel of potential matchups for Super Bowl LI offers a fascinating journey into the universe of “What if?” With so many possibilities kicking around, they’ve asked me to cook up a list ranking my favorite would-be Super Bowl showdowns. Invariably, this will not comply with YOUR LIST, which will lead to an urge — in some — to tweet at the author with low-wattage jabs such as: YOUR DUMB , THIS LIST SUX and DO U EVEN WATCH FOOTBALL? The historical perks are obvious.