We were talking about the primary campaign and not the actual presidential contest.
It would be the republicans pitted against each other.
The primaries are a prelude to and aligned with the way the voting goes in the general election. What good does it do to have one system (by counties) in the primaries if that will only be overtaken in the general election by the popular vote within the state ?
We can keep wearing those red county t-shirts forever and never win an election.