I respectfully disagree with your theory. I think the animus is real.
Like it or not, however, the two of them may be compelled to work together to avoid a brokered convention and some schlub ‘compromise candidate’ taking the prize. I hope they are each big enough, wise enough, and humble enough to do that, however unpleasant or awkward that may be.
I won’t argue my point too hard...it may be more wishful thinking.