The clinical definition of creativity is "finding new associations between known things." Which means creative people ought to be forgiven for being nonlinear thinkers.
New connections are not obvious and are found on "the road less travelled." Which makes meetings difficult because a creative person will inevitably veer off the typed agenda in an attempt to solve the issue at hand. This makes rational, linear types -- like accounts execs and marketing directors -- want to pull their hair out. But, as a colleague I worked with once said: "Ideas aren't like work and can't be managed like work."
This axiom never went over well because it meant "the suits" couldn't control the process.
Do this make you nervous? Is it incompatible with your business model? Well, you can try to domesticate creativity into predictable and derived solutions... or you can open up your way of doing business to accommodate fresh thinking and new connections.