Well, they would choose the idea only if they like it, so imo its not that bad. I mean you pitch your idea to somebody, if they like it, they are in (pretty much like finding a co-founder), not sure if they have any say in features?

i'm looking for some information here...how do you not be an "idea guy" if you have ideas? I have detailed business requirements, well thought out mockups, use cases, I listen well, "stay out of the kitchen", what else?

I'd say contribute in as many other capacities as possible, like sales, accounting, PR, business dev, etc. Make the final vision a shared one, and don't consider "the idea" to be what entitles you to the fruits of the business.