>>50469034Yellow was made as much to fill out time while they still delayed GS to keep Nintendo off their backs, but with Pokémon 2/GS being started before the anime hit, I'm sue they had the sprite designs done, then needed to edit them after delays, anime and Yellow, so went the go-between route due to Yellow.
Have to say, hashing out the origins and evolutions of designs (in as much the outside meta factors occurring at the time that drove them) is interesting as fuck to me. We know it happened, but I like knowing how exactly it happened.