From the Bloc
I don't think he thought him fit for the position. Trump doesn't think like that. It seems to me that he wanted someone to shake things up and force out Preibus and Spicer - who were pretty much assigned to their jobs by the Party - and he's too cowardly to do it himself.Scaramucci brought it upon himself.
However, what does it say about Trump; that he thought such a person "fit" for the position, someone vile and uncouth, just like himself?
I do think however that Scarjerk did think himself fit for the position, and is now realizing that for all his efforts and sacrifices, Trump simply used him then had someone else fire him.
This is how Trump treats his loyal supporters and staffers.