Right after college I started consulting at an eCommerce company that had bought a 17 year old's website for over 1M. Had had built a gaming community site that had become very popular and they wanted the traffic. I thought the kid was just lucky until I was in a meeting with him. His thought process basically ran circles around everyone else in the room, some twice his age. I realized then, that there are kids, KIDS…
You have a very good point. Thought process and vision are what make or break a product. As close as it is to other news aggregators, there may be a perspective that the Founder has that Yahoo team doesn't.
I would put far more emphasis on execution. Lots of founders with "vision" can spin great stories to investors but can't execute quickly enough, or are unable to deviate from their original vision when the market or other evidence suggests they should.