There's been a lot of focus on Red and Blue, though.
Kusaka doesn't know what he wants to do with Red.
gdi
You have the other ships are pretty clear. It's the protagonist x protagonist.
Gold x Crystal
Ruby x Sapphire
Diamond x Platinum
Black x White
Blake x Whitley
X x Y
Sun x Moon (?)
So naturally it makes sense for Red and Blue and that's what he's been doing lately since FRLG and ORAS.