Premise: And given that his columns are ephemera, why shouldn't Will give them up for his true love?

Hypothesis: Will's columns are short-lived, so why shouldn't he forgo them in favor of what he really likes?
Answer: yes

Premise: Executive leadership is essential to the successful execution of this factor.

Hypothesis: One of the factors essential to successfull exeuction is executive leadership.
Answer: yes

Premise: There, Poirot, you are quite wrong!

Hypothesis: Poirot you are not correct.
Answer: yes

Premise: Generally, if they had the resources they don't need shelter and they can afford private counseling.

Hypothesis: They need assistance because they don't have enough money to afford private counseling.
Answer: it is not possible to tell