I'm pretty sure Sakuri picked Roy as the Melee vet because he was the most popular Melee clone who didn't make it into brawl
yes I know Mewtwo is a clone but it dosen't count lol
you can't deny that Roy wasn't a popular choice, if you watched the Nintendo World Championships when they brought out smash bros you could hear the croud shout "ROY'S OUR BOY, ROY'S OUR BOY"
and when they were developing the game 4 characters got other characters as skins, and three of those skins got upgraded to full character, one of them just happened to be from FE
I don't think Sakuri has an FE bias, because the hate for one series gets moved on from one franchise to the next, if I recall just a few months ago everyone seemed to be crying that there was too much Kid Icarus stuff
as for the Inklings and why I didn't think they ever stood a chance or ever will