[zwetan]

it is exactly the opposite imho

the idea can already be there, already implemented and even already successful

and an incredible execution can just take over

you don't take over on ideas, you do take over on implementation

few examples: hotmail and then boom gmail took over, IE6 and boom Firefox took over, etc.

in fact implementation is so much more important that you have to keep doing it right otherwise someone else take over

also you can not keep an idea secret forever, once you release your product, everyone know about it and get a shot at their own implementation of your idea