Trump does not need someone else to drop to win based on math. If the voters don’t choose him (and apparently they are) then he loses. Cruz needed Rubio to drop, or now it’s Kasich, to “make a path for him”. If Cruz was as brilliant as everyone has said he was (even himself) would be not be in the lead?
the math says that over 50% of all voters decided Trump should NOT be the nominee.
Is that simple enough for you?