The questionw as about McKay, not some other team; just because other people can do multiple genres does not mean he can. That was your big "connect the dots" thing? So clever
My point is that Marvel has REPEATEDLY taken directors with no action/superhero/blockbuster experience and seen them put out very good films.
Jon Favreau went from Made and Elf to Iron Man
Joss Whedon went from Buffy the Vampire Slayer to THE AVENGERS
Shane Black went from Kiss, Kiss, Bang, Bang to Iron Man 3
So maybe we shouldn't jump to conclusions based on McKay's previous work.
I can't believe this needed explaining.