It's not even the speed, it is just they are both spurt fighters.
Boxing had the same problem with its 120-130lbers until the golden age of those divisions came with Pacquiao, Morales and MAB.
Pretty much, i over simplified it - 2 guys who fight in bursts with great footwork and reactions is a recipe for disaster. Best thing to hope for is one of them gets clipped early and it ends there, with Dodson being more likely to be doing the clipping.
More Mexicans would be a good thing, i don't think people would of even cared about Pacquaio in them early days without them...he would of been another ignored featherweight. Need some people who will use there speed and size to stand in the pocket and do damage.