It's alright bro I hear ya. As I said before, it's most certainly not impossible. IMO, I think Kraid's problems aren't even his size, but just the fact that compared to Ridley he doesn't have nearly as much importance to Samus and Metroid as a whole. Still, he's definitely iconic, and is a fan-favorite in the Metroid community, so who knows?
Anyways, I guess we need to get back on topic so...
Ridley looks like to be a good size here (again, this is based on Super Metroid, where with the exclusion on the Original Metroid was his smallest depicted size). But I kind of want to point out too that he seems to have good body mass here too. A common complaint of Ridley is that he's a bit too lanky, however I still attest that's because of Brawls model more then actual Ridley.
With Zero Mission's design, besides maybe his waistline he doesn't seem as nearly as lanky as one would think. Powerful legs, muscle arms (nowhere near Other M though), broad shoulders, and his neck doesn't look like two sticks glued together. So I think just about any Ridley design (Super, Zero, Meta or Omega) would work in the game, which is why I keep insisting that Brawl's design overall just isn't good.