My theory was based on the belief that cautious admissions officers would over-interview and under-accept.
If, in fact this did not happen, the stalemate will continue until mid July.
Even then... unless applicants are really unhappy with their PTE medical school and/or financial aid package and forego medical school... theres very little reason why PTE students wouldn't automatically become CTE students.
How would CTE deadlines make a difference with the stalemate unless (as you said) a few schools under enroll and are waiting for more movement?