My co-founder brought up the same objection when considering joining AngelPad. I responded with the following:
Two of the seven partners are currently running their own startups -- Vibhu Mittal is the founder of Root-X Research (dedicated to improving learning online, etc.) and Gokul Rajaram is the founder of Chai Labs (acquired by Facebook last week).
David Scacco (though not a founder) is one of only 4 people at MyLikes, a very new startup with seed funding. He's already shown his ability to execute by bringing in early revenue from advertisers and securing multiple partner commitments to grow their company.
Keval Desai co-founded Achex (a la PayPal) with Michael Arrington over 10 years ago, which was acquired in 2001 by FirstData for $32M. That's in addition to him being the pioneer of Google TV Ads and currently working with Kevin Rose in a leadership function to re-launch Digg.
Deep Nishar founded Patkai Networks (a B2B online services provider) 10 years ago before moving to Google and now is essentially the #2 guy at LinkedIn (granted, a good-sized company now).
Rich Chen is an accomplished angel investor with multiple successful exits in his portfolio companies in recent years, but he too founded his own company in Japan called OptoMail 10 years ago, which was a B2B email marketing startup.
Thomas Korte is a founder in his own right by being the lead in launching AngelPad. However, he too has startup experience (though not a founder) at an enterprise news startup a decade ago called Moreover Technologies.
So whether prior to or after Google, every one of the partners has significant early startup experience to complement their leading roles at Google. Just wanted to make the clarification.