[QUOTE=Guilherme;6809150]
No, not really! 
A horse with a very lateral gait and any overstride will often have a rear leg slightly longer than might be considered “normal.” This is not a conformation defect if the leg is normally shaped and properly attached to the hip. This will give the impression of being built “downhill” but, again, that’s not necessarily a bad thing. As long as it’s a fully functional part of the whole horse I don’t see any issues. If the leg is not well attached or if, as is common, is “sickle hocked” then you’ve got a serious flaw. A crooked leg is not as strong as a straight leg (“straight” here meaning the leg has proper articulations). The bent hock actually is an advantage in over stride and that is an advantage in some gaits. But the bent leg will break down sooner that the straight leg and the horse’s performance career will likely be shorter.
The conformational differences of a gaited horse vs. a trotting horse will be few and subtle. Just what they might be will be determined by breed (what does the breed standard require) and by way of going. A lateral gait might well have some differences to a more diagonal gait. But, again, these differences will be subtle. And in no case should they be outright flaws, like sickle hocks.
G.[/QUOTE]
I agreed with most of what you said, but I did want to point out that ‘overstride’ is misunderstood by most people. A horse with good overstride literally steps bigger or longer with its hind legs in its walk. So a crooked leg will give the appearance of a ‘deep’ step behind. People will get all giddy and say, “look, Sir Stacksalot is stepping deep and has a lot of overstride. See how far he steps past his front feet?” When in reality he is also coming off the ground sooner behind, thanks to that same crooked leg. He has no more overstride than a clean legged horse-- his stride just happens further under his body for mechanical reasons. And because he is crooked legged, no matter what his hind leg stride is (long or short) its not going to hold up to years of use thanks to his poor conformation.
Long story short-- a crooked hind leg only creates the illusion of overstride. It has no true affect on the overall length of that hind step.