"single handedly"? Really? Jose did a humongous work, but this is so dismissive of all the other people who put time and effort into building the ecosystem and the community.
While there are certainly other evangelists, and Erlang aficionados tend to engage too, I don't think I've seen any discussion of Elixir in a public forum where Jose hasn't been involved, giving well thought out, humble commentary.
As the founder of the language, the lead evangelist, and the main mouthpiece, yes, 'single handedly' may be hyperbolic, but only slightly. It's not to dismiss others' inputs, but it is to highlight how -insanely- engaged he is. I can think of no other language founder who has put in nearly the same legwork.
> I can think of no other language founder who has put in nearly the same legwork.
I don't pay particularly close attention these days, but I'd think Rich Hickey's involvement in Clojure over time, at least to the point Elixir is today, would be comparable.