"Weakness of Trust"
And yet....Saix planned to take over the Organization and betray Xemnas with Axel even during KH 358/2 Days, and yet he became a Xehanort?
Makes no sense. Xaldin was much more trust worthy than Saix...so was Lex, Vexen, and Zexion. They were all more trust worthy than Saix and none of them were used. What is the excuse for Xaldin? He had no weakness of trust...he followed Xehanort to the end...he had no weakness of will....he was the only member who didn't want his heart back and likes it better without one, and weakness of body? Xaldin was considered one of the strongest members in the organization
It's just a big contradiction after another to be honest
You can't contradict what isn't bluntly confirmed.
Given Saix's eyes and ears, it's likely his nortification was already so far along that he wasn't a concern for Xemnas. Could just take control of his mind if he tried something for real.
Keep in mind that I did say "some" when mentioning those sent to CO. Vexen wasn't expected and it's unlikely he expected Lexeaus or Zexion to fall either.
Xaldin has nothing to do with this topic as it's about CO of which Xaldin dind't go to. It's also not known were he stood with Xehanort, for all we know he could very well be one of the "surprise" vessels of KH3 given he and Vexen were still "unstable" in DDD.
The whole "weakness of body, will and loyalty" was Xemnas just naming off a few that wasn't suited in his eyes to be vessels.
Who exactly he's referring to in it's entirety isn't said. We know loyalty means Marluxia, Larxene, Roxas and by KH2 Axel.
Weakness of body could be either Vexen or Zexion but since Vexen was unexpected it's likely it didn't apply to Vexen and there's no confirming it meant Zexion either.
Weakness of Will could be Demyx but again nothing outright said.
Aside from the obvious betrayers there's nothing really saying who Xemnas is referring to when he names those categories.
They said all the apprentices were loyal. Namely Vexen, Zexion and Lexeaus.
Who said? From what I recall it's never been said by official places that every member was a loyal one.
From what we seen in CO those three obviously were loyal. They wanted Riku in order to counter Marluxia's traitorous plan.
Marluxia & Larxene have never been shown to be loyal.