this is what makes this episode great in its conflict and dilemma...the casualness in which the million dollar idea came to be. Whitleys frustration at tutoring sparked an idea by Ron and Dwayne chimed in (lets not act like it was ALL Ron's idea). Ron just tossed out an idea on a friends kitchen table. If Dwayne designed and pitched it and it FLOPPED Ron wouldn't have thought "oh I'll just hire someone to develop it better" He would have just let it go and not given it a second thought.
This is a classic
It's All Fun And Games Until There's MONEY On The Table! scenario.
Remember in the history of the show...Ron was always coming up with ideas (in sitcom speak it would be called "get rich quick schemes") or small business hustles like the wake up call thing he and Dwayne came up with....the first time they collaborated.
here its clear it was Rons idea that Dwayne jumped on but the difference is they BOTH actively worked on making it happen.
In the gameboy thing....once Dwayne had the core idea, he just set his mind to the technical side of developing it. Any further input from Ron wasn't necessary which is why Dwayne never thought to consult with him after that. And since he designed, pitched and sold the thing by himself, he didn't consider Ron's initial input significant. THAT'S predicated on the fact that he really always looked down on Ron as
@playahaitian observed:
and it was. By the 4th season we see Ron grow more into his own character. In the first two seasons he was more of toady/junior partner for Dwayne but in the episode where they join a frat, Dwayne dropped out while Ron finished and that established his own character in its own right (great episode). So their dynamic was built on Ron playing second fiddle to Dwayne and Dwayne had a sense of superiority to him because of it
Remember, in anger, Dwayne offered 5%....I voted 10 but IMO thats the ball park of a proper split considering the circumstances of how the game came to be.