Yes, it's a very cryptic way of wording it. I interpret it as they go by scores, and as Kiibus is first on the list with 202.04, Watanabe will top that.Not according to the GP announcement, I don't think. The announcement says:
I read that to mean, they'll be added to the bottom of the alternates list, and if multiple skaters win a Challenger and get added, their order will be according to scores. So Rinka shouldn't be at the top of the list, according to the rules.
Practically speaking, we know they can be somewhat flexible with the replacement list, so I'm not saying she may not get a spot or two.
I think that's the way it works, because otherwise there is no explanation to why Egadze got a GP assignment after he won the Austrian Challenger last year.