Of course, if you're an anti-Trump voter in NY, voting Carson is just as good as voting Cruz or Kasich, provided you don't live in a district that Trump could conceivably lose to Cruz or Kasich. If it helps get Trump under 50% in your district, a Carson vote is as good as a Cruz or Kasich vote. The only issue would be if you lived in a district where the Cruz-Kasich margin was close, and you had a strong preference as to which of them should get a delegate.
Correct. Which is why I am confused why Carson is on the ballot. Carson endorsed Trump yet he does not take his name off the ballot which could only hurt Trump and not help him all things equal.