Isn't idea guy actually domain expert which understand certain problem in a area like nobody else? She or he could be a medial doctor, maybe veterinarian, maybe

Isn't idea guy actually domain expert which understand certain problem in a area like nobody else? She or he could be a medial doctor, maybe veterinarian, maybe small business owner, maybe cook, etc. Idea guy does not necessary need to be business guy which means that idea guy might be also a geek - and matching two geeks from different field is a big challenge.