I could be wrong, but referencing the Forbes survey that you cited - the results went against your conclusion...

Idea vs Execution (or which one is more important) votes:

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Arthur Blank: both

Tim Blixseth: both

Otis Booth: Execution

Mark Cuban: Execution

Gerald Ford: both

Danny Gilbert: Execution

Kennet Hendricks: both

Wayne Huizenga: Execution

George Kaiser: both

Michael llitch: Idea

William Moncrief: Idea

Phillip Ruffin: Idea

Jorge Perez: Execution

James Sorenson: both

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Both are equally important (tie): 6 votes

Execution: 5 votes

Idea: 3 votes

Conclusion: Execution wins