[tjl]

I know that at least one former Amazon CTO was an excellent coder, although he didn't really do much (if any) while as CTO.

I don't know of many companies that have a "Chief Data Scientist" that reports directly to the CEO. In all honesty, they're more likely to report to a CTO.

Also, there's a reason why the C-suite people have the word "Officer" in their title as they're officers of the corporation and that implies additional legal responsibilities. It's not necessary that it be in their official title, but it typically is.