Solidz, and 1on1: Well, it might sound like a copout, but here goes =)
I feel there's more than 1 kind of intelligence... I just blathered on about this very subject in
another topic. Sorry to go on about it, it's something I find interesting.
You know how you'll hear some people say "I may not be book-smart but I'm street-smart!" or whatever? Doesn't that just make you want to roll your eyes? But in some cases it can be true. There are smarts you don't learn in school or on the job, and they aren't always obvious at first glance. There are guys who fail calculus or physics but they can figure out the drop of a bullet and estimate range and wind to make incredible shots with a sniper rifle. There are others who chose to drop out and work in a garage, and they have put more time and have more facts memorized about cars than you or I have put into, say, major authors or american history or whatever. Ask those guys about the civil war and they might sound like morons. Ask them about torque or ballistics and they sound like geniuses.
Maybe I'm being too liberal in my interpretation of the word "intelligence" but I believe that spatial reasoning, visual memory and being able to innately understand the physics of the colliding balls are all a form of intelligence, and if the guys with an enthusiasm for pool had dedicated their brainpower to some other subject that uses those things (architecture, engineering, whatever), they'd do just as well because they're smart that way. That intelligence just happened to be directed towards one thing instead of another. These are the guys who shoot pretty sporty in front of 1on1pooltournys and seem uneducated. And they are uneducated in the strict sense of the word but they're not unintelligent. See Jaden's post for the shorter version of all this :B
Whether all of their intelligence is learned or they're at least partially born with it is a muddy area, and at the end of the day if I say "some guys are just born with a certain kind of intelligence that's really good for pool" ... I may just be saying "talent/genetics" all over again and contradicting myself >_<
But I truly believe different flavors of intelligence exist, and the ability to be intelligent is in some way learned, you just need to be brought up in an environment where being analytical and logical is encouraged (at least on the pool table). The guys you're thinking of, solidz, who are pretty smart but struggle on the pool table... maybe they're smart in a different way or maybe they are educated and have a great deal of memorized facts at their disposal but lack common sense in certain ways. Not in ways like "if I write a bad check it will screw me" but on a more basic level like "if I hit something hard it can pass through a solid object like it wasn't there".
Something I notice in players who are NOT improving and are always behind other players: They fail simple common sense tests like "this didn't work for me last time. Will it work this time?" "That ball looks like it doesn't go, should I shoot it anyway?" "I know I jump up and twist my wrist on every shot and try to spin in balls that don't need it. Should I break that habit, starting right now on this very next shot?". "I know if I make that ball I won't have any hope of sinking the next one. Should I just go ahead and make it anyway and hope for the best?"
These guys make the wrong decision over and over (hi, Twoforpool) and I can't help feeling there's something fundamentally UNintelligent about this, even if they're seemingly bright people off the table.
Maybe a better way of phrasing what I'm trying to say is... the people who are behind the curve all seem to unintelligent in some way. But I hate saying it that way because it sounds like I'm ragging on the original poster when I'm not. Whether or not he has a 'brain for pool' is just one theory out of many. The answer to his question could just be as simple as "the other guy really is getting in more practice behind the scenes".