I also sort of intended for T10's to be special. They way I plan to scale things up, you won't be able to keep pace with the missions if your just holding every candidate back until T10.
Also, remember, people think it's weird how strong JU is now. Handyman and Menagerie Witch are clear A-listers, with Doctor Silver being an A-lister who is categorized as a C-lister because people don't know about his spacial awareness or the Hustle. Valiant Gold and Black Swan are S-Class. Only Chatelet and Lady Leizi would be B-tier, and their superlative at what they do.
You start adding nothing but A and S-Classes? People other than Crusade or who you call The Philosophers will start to notice.