I see your point. Looping this back to the OP …
The ideas guy, in this case, pubg, already had a mod of the same game. he just made it in to a stand-alone game. Was he an “ideas” guy tho? Nah, he was a modder. Futher, he was the guy behind the H1Z1 King of the Kill (aka pre-pubg). So i mean, its not that he knows nothing, he just has an entire company to back him now.
TLDR: ideas guys need to be able to pay a team to make the ideas real. key word: pay. pubg is a great example of how an “ideas guy” gets things completed.