Why You Really Need A Co-Founder (Or Two)(codepreneur.tumblr.com)
codepreneur.tumblr.com
Why You Really Need A Co-Founder (Or Two)
http://codepreneur.tumblr.com/post/57717923667/why-you-really-need-a-co-founder-or-two
http://codepreneur.tumblr.com/post/57717923667/why-you-really-need-a-co-founder-or-two
Sure, it's one data point. It's one validation. But both of you may be "delusional" in the sense of thinking you have a valuable idea when you really don't (yet). Generally speaking. This happens a lot when things change, and startups pivot, but the team remains the same.
I was curious why your post didn't include anything about reaching out to users, user testing, doing customer development, etc. I would say THAT is your starting point to see if your idea is validated for product/launch fit, and then go for product/market fit.
The greatest validation is product/market fit. You have growing number of users, traction, money flowing in... and so forth. that is the greatest validation.
You can sell yourself and your vision pretty well to someone else to become your cofounder, but I am not convinced it's the "greatest validation" your idea can have. Especially since your "idea" most likely will go through iterations and change.
I do agree, though, that having a cofounder really helps. But not for the reasons you said.