An exercise in utter futility. I've never seen a situation where the #1 and #2 leaders in terms of delegates get bypassed for #3, 4, or 5. That's like saying if Hillary and Bernie don't win a majority, the nomination is going to Martin O'Malley.
Do you really think Cruz and Trump voters, after getting boned out of the nomination, are going to line up behind Kasich (the ultimate DC Establishment insider)? Better off going with the choice of the primary voters and let the chips fall where they may. I may not favor Sanders over Clinton, but if he gets more delegates I'm completely opposed to not giving him or Clinton the nomination in favor of a 3rd person even if its Biden or Warren. That's not fair and it would be an electoral disaster.