Actually I forgot to account for yellows. Yellows are within one rank of silver so that matchup isn't an issue. That leaves a 40% gap between the lowest orange and the lowest yellow. It's only 60% if you also want to count reds. That's maybe not a bad idea either since reds and dark oranges are only 1 rank apart as well.
Did I mention how much I hate this two-orange color scheme? :P Dark orange is clearly not red no matter how hard you squint. I mean we could always make brown dwarfs, I dunno? Brown?
And I still think at the very least that MM games should be ranked by the lowest ranked player rather than the highest. I'm sick of sifting through red dwarf games that are labeled "supergiant", or worse, "neutron star".