By Tzvi Machlin In 10 NFL seasons and seven as a full-time starter, Kirk Cousins has been one of the most consistent quarterbacks in the NFL. But he’s consistently average to above average, which is part of the problem. One stat has been going viral this weekend really tells the tale of just how average he’s been: His record as a starter. In 120 starts since 2012 he’s 59-59-2 as a starter. In fairness to Cousins, a lot of those losses came while he was relieving an injured Robert Griffin III on some terrible Washington teams. But he’s just 33-29-1 in four years with the Vikings. 2021 was a car…