Big statement there re "The numbers are sound"; the article certainly provides no insight into, for example: how these numbers were sourced / compiled, what constitutes a smartphone, etc...
So unless you're privy to more factual data, it's certainly not sound at all.
The problem with this type of market share analysis is that it can be "presented"/manipulated to justify almost any opinion, for example:
http://ben-evans.com/benedictevans/2014/1/28/market-share
Android is certainly by any measure far more prolific than iOS, but that alone isn't a definitive measure of a company's success. The only real Android winner is Samsung, everyone else (including Google) is bleeding a lot of capital.
So if we're to assume that Android is such a sure bet, then why has only Samsung turned a big profit? + why is Apple generating more revenue and profit from an apparently diminishing market share?
Basically these comparisons are pointless!