By Alek Arend Joe Theismann is getting crushed for his old tweet about Kyler Murray this Thursday. Back in 2018, Theismann congratulated Murray for winning the Heisman and then encouraged him to quit football and play baseball. “Congratulations to Kyler Murray on winning the Heisman,” he said in an old tweet. “Now go have a long career in baseball.” What’s so wrong about that? Well, Murray signed a five-year extension on Thursday to make him the second-highest paid quarterback in the NFL. Had Murray chosen baseball and played for the Oakland A’s, his current NFL salary would have been almost e…