One stat that's very meaningful, but which ESPN ignores, is passing efficiency. Murray and Tua are both ahead of the record of 198.9 that Mayfield set last year.
205.7 - Murray
202.3 - Tagovailoa
175.8 - Haskins (same as Jake Fromm)
ESPN's announcers are not allowed to talk about passing efficiency ratings, which have been used for decades to evaluate QBs. They have to talk about QBR instead, which is a thing made up by ESPN several years ago. I've heard Todd McShay say on the air "I'm not allowed to talk about that other" statistic. I will never trust QBR, since they invented it and have their reasons for using it instead of passing efficiency.
But the difference in the efficiency rating, largely due to yards-per-attempt, is why I won't be very ticked off if Murray wins the Heisman tonight. I'll be ticked if Tua wins, since the margin will almost certainly be caused by the 10% of idiots who voted before last Saturday, of which I'm sure 90% voted for Tua.