My "issue", if you can call it that, is that he's going from Amazing Exia to 00 7 Swords. It isn't that big of a jump, I'm just anal about it being kinda wierd a transition. It's going from base Exia to a highly customized and powerful Exia to an ostensibly less powerful upgrade of the 00 as a final suit. Going by canon the 7 Swords System was discarded as being redundant when Exia Repair 2 rolled out with its more advanced GN Sword Kai and only returned for the Qan-T since it could use them extra blades as bits, even if the 00 has the Twin Drive system the complete Amazing Exia should probably be superior to everything but the 00 Raiser/Qan-T amongst Setsunna's MS.

I was suggesting keeping Exia as a starter then moving on to the Exia Avalanche Dash, since it's the base Exia with a full body armor that upgrades all its abilities. It's a fun gimmick of taking a unit that's starting to lag behind and strapping cool gear on it to make it better, also the base Avalanche Exia has tiny legs and I don't like that, it's why I suggest the Avalanche Dash, making just a torso armor instead of a full body thing makes no sense to me. And then you take the Exia and rebuild it from the ground up into the Amazing Exia. It's still good ole Exia, just 50 times more badass and capable of fighting the best of the best head on.