Yeah, pretty much. :( Actually reminds me of a Sync and Arietta thing from Pixiv that someone translated on tumblr. You may or may not have seen it??
She probably could have! Though the fact that no only did they take and eventually 'killed' Ion they had also killed her Liger mother so she kind of had two things against the group.
My sister and I spoke about that the other day! It was probably Van's doing/done on purpose that those two had as little interaction with each other as possible. Since Sync is a replica of the original Ion, Van wouldn't have wanted Arietta to catch onto something which she might have if she spent enough time with him. The two times they were at the same place one of them all the God-General minus Asch were there (St. Binah), and in Choral Castle Arietta was on the roof while Sync was with Dist. So even if they might have been in the same room in Choral Castle at one point it was never just those two.
/rambles about things you might have already figured because SyncAri. :'D