I don't think sword catch can catch Z-saber, mainly because it is an energy weapon.

Air-Dash attack (Mach Dash) in Blade Armor is semi-invincibile. X cannot be stopped, stunned, hurt, caught during the dash.

X can evade attacks just as well as Cloud. (With his double jumps, air dash, ground dash, etc.) He can even air dash in all 4 directions, frontdash and backdash, and he can finish the dash with a really long-ranged jump. When he is doing all his jumping and dashing, he can use any of his attacks. When X is dodging an attack, he can be countering and firing back at Cloud at the same time.

X doesn't have to get close to Cloud if Cloud is being knocked down... X can shoot him and make him get up from a distance. Keeping a distance from the enemy is always X's way of battling.

About the damage barrier, well you see, X has his disadvantages. He can't block. Well he can, by using certain Maverick weapons, but naturally he can't. It is how it is in-game. When an enemy shoot multiple missiles at X, if the first one hits, X will take damage and start flashing (or, a circular energy barrier will surround X), other missiles will hit X as well, but they won't count for any damage when the barrier is active / when X is flashing.

Cloud's Dexterity is just on the average range (the speed, on a round based battle system)... for he's wielding such huge weapon and all, his movement should be slower comparing to X. Cloud's magic defense is just average (Spirit), but even if you are to say that Maverick weapons are physical...True, Cloud doesn't have a specific weakness to any of those maverick weapons (He's not a Maverick, afterall. I hope...) The argument about Maverick weapons not doing lots of damages are faulty. Charged Maverick weapons do immense damage when they hit, some of them, Ray Arrow for instance, are even comparable to the Gaia attack.

There are several things you're forgetting though. X's weapon energy will recover as he takes damage, and he has two Sub-Tanks and 1 Life recover. Plently of energy before he'd fall down. (By the way, I've never seen X fall down...he can get stunned if he doesn't have certain part equipped, but fall down on the ground...but it's something minor.)

P.S. Got to go out...might come back.