Seems pretty solid overall, though you should probably add that your list includes skill awakenings as well since for example Sera is the worse non silver priest warrior untill you SE her.

There are some points I wouldn't exactly agree on tho:
Aria over Kate: aria might have slightly better ability, but her low defence makes her useless on late missions. I'd even place her under Julian.

Claire is much better than two gold archers probably as well as Rita. There is a reason she is one of most seen archers in the niconico and that's her brutal raw power.

Juno's skill is garbage until skill aw. Even after it she's, well, not the best suited for a priest role. Her skill use is much more dangerous for you in most cases than other plat priests and basically requires you to pick another healer in party just in case

I'd probably place both premium plat feng shui's over Pipin. Pipin ability is not useful at all unil you have 2 FS in the sortie which is pretty rare case since the have limited range.

Rest is pretty good, though I'd hate to see people making the decisions on their premium rolls based on that list since it does not take into account utility abilities which are often more important for a player than raw battle power :P