If you look at the IMDb page of a guy like Terry Gilliam, he doesn't always work with the same people, but his movies still look like they were directed by Terry Gilliam because he tries to be in charge of every little detail. Same goes for Kubrick and to some degree Scorsese (a big part of the Scorsese style is due to the editor he always works with).
There aren't many directors like that, though. If a guy who doesn't have the talent tries to pull that off he'll just come off looking like a douchebag.
