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Executive means the government as opposed to the legislature, ie Congress.
You don’t seem to value precision or clarity.
The US Federal Government is made up of three, equal, branches. The Legislative branch is 1/3 of the government.
Executive, in an organisational context, is a senior managerial position ultimately accountable for putting into effect plans or board decisions.
I do agree that Kennedy is patently outmatched by the requirements of being federal health secretary, but administrative competence was not the reason he was chosen.
Executive means the government as opposed to the legislature, ie Congress.
Whatever actual responsibility Kennedy had in whatever he did before must have been trivial compared to being health secretary. He might have had a lot of influence, but it's very different when the buck stops at your desk.