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I’d vote Haskins. Almost 4,600 passing yards on 70% completion and  his 47 TD passes leads the nation and is the most from a P5 QB since Sam Bradford’s 2008 season when he won the Heisman. 

Haskins literally carried that team. He threw for 400 yards 5 times and really 6 if you count Michigan as he was only 4 yards short with 396 and absolutely shredded the then #1 D in America. Really could’ve thrown for 600 had he had the completions. Kid only completed the ball 20 times. Still wound up with 396 and 6 TUBS. Insane. 

And yes, the bad final game by Tua matters. Have to take into account the entire season. Even CCG games. The CCG games are when you want the player playing his absolute best.

Bama has more talent around Tua than Haskins has around him at OSU and Bama also has a way better defense backing him up. There were games where if Haskins wasn’t throwing for 400 yards and 4 TDs- Ohio State was going to lose. That’s a lot of pressure on a QB and the kid still delivered them to 12-1. I just feel like his degree of difficulty was so much higher. Plus- he’s just better. Period. There are throws that Haskins can make that Tua just can’t. Some of the throws Haskins made this year left me with my jaw on the floor. This kids arm is up there with the Drew Henson’s or Mallett’s or Stafford’s. His arm is a fricken rocket launcher.

I find it weird that despite all three having historic seasons, Haskins is being looked at has an afterthought.  Some articles don't even mention him.  Murray is very good, though the case against him is very easy - he plays in the Big 12 for Oklahoma and I would throw for 3000 yards if I were their QB and I struggle to throw a spiral.  

Kinda weird that the Doak Walker Award kid didn't even get an invite.

I find it weird that despite all three having historic seasons, Haskins is being looked at has an afterthought.  Some articles don't even mention him.  Murray is very good, though the case against him is very easy - he plays in the Big 12 for Oklahoma and I would throw for 3000 yards if I were their QB and I struggle to throw a spiral.  

Setting aside Big 12 silliness, I think the answer has to do with the way narratives can harden.
The Heisman is a storybook award, for bad or for good. It goes to someone with a story. Ohio State's is complicated. 
OSU spent most of the year as a disappointment. It's biggest failure was on a big stage against a so-so team, and the enduring image of Haskins was throwing again and again. He became the gunslinger doing what he could with a bad defense and not much running support, but it remained in the context of disappointment. The big non-conference win evaporated. And there were stats, but they always had that looming over them. Sadly, that doesn't get a guy a Heisman.  
And in that, we probably underrated what OSU and him were doing. I had a friend who is an ardent OSU fan, one who is often levelheaded, and when the Michigan game came around, he said something like "If Michigan can't beat, THIS Ohio State team ..." 
Of course THIS Ohio State team was 10-1, No. 8 in S&P. But they couldn't shake that feeling, even on here. As such, what should've been a big win in The Game became more of a referendum on Michigan. The BTTG didn't help, with a team destined to get loss No. 5.
Basically everyone, including many of us, treated OSU like a disappointment right up to the end, and by the time that could shift, there wasn't enough runway to fully throw things back into a positive gear. If something like the Michigan game happens 2-3 weeks earlier, I'd bet there's a better chance Haskins is contending and maybe there's a more real discussion about a playoff spot. 
(It also brings into relief the situation in 2014, where OSU got the defining win at the start of November and benefitted from the Big 12's split/lack of a title game)

Kinda weird that the Doak Walker Award kid didn't even get an invite.

For better or worse, 7-5 teams don't get their guys votes. 

For better or worse, 7-5 non-helmet teams don't get their guys votes.

Fixed.

Haskins is sort of a third wheel because he lags in QB rating by 30 points.  That’s a lot.  How much is it?  
The gap between the careers of Cousins and Lewerke.
Chuck Long and James Landenberg?
JT Barrett and Steve Bellisari



A big gap.

I don't recall QB rating ever being much of a factor in Heisman races