When we had been inside earlier and they were trying to play with cars together (something DS does EXTENSIVELY and elaborately on a regular basis in his own little world), we ran into problems because he just had a certain way it wanted to be done. He is usually the king of his little vehicle-play world, and the other little girl stared blankly when he started going on about the toy train being a steam engine and needing coal. When they tried to race them, well, let's just say all hell broke loose. He is very particular about how he plays with his cars, and is used to doing it alone and at-will, or with an adult.
This sounds less like a gifted thing and more like a kid who hasn't had to negotiate playing with others much yet. It will come. They need a certain amount (not too much!) of this. He may also prefer parallel play for a while longer.
I notice that my second child has had a much easier time learning to play with others than my first did, surely in part because he has been negotiating in play from as soon as he COULD play.
