Actually, Carson's selection has nothing to do with the numerous, qualified people President-Elect Trump cold pick for Surgeon General.  Never minding Obama had to fight HIS OWN party for confirmation of his Surgeon General nominee Dr. Murthy; Trump's decision of Dr. Tom Price to lead the DHHS has been met with great support from people who matter, like the American Medical Association.
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https://wire.ama-assn.org/ama-news/why-we-support-dr-price-lead-hhs
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There is therefor no reason to think his other nominees for the other positions should be less "logical."  Sorry.