Partially no and let me explain why: It is because the leo is a mobile suit from a different series/universe. It is a rule, or has come to be a rule, that you can't use a mobile suit group from a different series for the main portions of your fights, one off fights possibly later are an acception, Arthanus and I have already come to compromise on the rule that they don't have to be natural progressions of each other so I'll allow the last two since they are both from Mobile Suit UC Verse. However you'd need to replace the Leo since as I've said it comes from Mobile Suit Gundam Wing not UC.

Also I'd like to say I'd reconsider the suit line up in total because late game means Fin Funnel/Bits/Dragoons, Newtypes, beam spam, and elite pilots and while that is true for our side do you really want to get stood up by people like Athrun and Banagher Links end game? If you're fine with that then feel free to continue using the last suits while switching out the Leo.

 If you'd like I can give you a hand. Mobile Suit Gundam X has the following suits that You'd be able to work fairly well in:
http://gundam.wikia.com/wiki/Swordmaster
http://gundam.wikia.com/wiki/GW-9800_Gundam_Airmaster
http://gundam.wikia.com/wiki/GW-9800-B_Gundam_Airmaster_Burst