I don't think we really have enough data for rankings like this. For example, what evidence do you have to support that Christina is just treading water? Her season ended on a pretty good note at 4CC and her public statements afterward were all determined and clearsighted about where she needs to improve. It may be her off season training is going very well. And how do you know that Angela Wang isn't making improvements over the summer? She had quite a strong season and is well positioned.
Also, considering that Ashley ended the season 1st at Nationals, 5th at Worlds, and 2nd at WTT, I think it's a little too soon to say she's "going down." Granted, the patched-together coaching situation is not encouraging, but I'm not giving up on her yet.
This is exactly what I was going to say. We haven't even seen most of the above compete in the off-season yet; the "big" names -- Gold, Wagner, Nagasu, Czisny, Zawadzki, and Gao -- have been out of the competitive spotlight since the end of last season. We have no idea what condition they're in. Ashley, whatever her coaching situation might be, is still the reigning US champion. Alissa is still known as a former leading lady. Gold is the obvious heir apparent to the US ladies' throne, but she's been notoriously inconsistent. Zawadzki and Gao had strong showings at Nationals and have both demonstrated that they're going all-out for the Olympic season. If anything, Nagasu and Caroline Zhang seem to be in the most danger right now.
AFAIK, only Gold has made any definite summer competition plans (Skate Milwaukee, next week). Czisny has already stated that she won't be competing until the GP, at the very earliest. The rest of them have been tight-lipped.
How many of the above have been in summer competitions, so far? Just Edmunds, Miller, Wang, and Siraj. Rachael Flatt has already put her career indefinitely on hold to pursue her studies at Stanford; I doubt if she'll ever come back. Nina Jiang, Samantha Cesario, Leah Keiser, and Vanessa Lam historically haven't been strong forces among the US ladies, but that could change. We've yet to see if Courtney Hicks can medal at 2014 Nationals, or if her pewter medal last season was a fluke.
Therefore, any assumptions that certain skaters are moving up, down, or treading water are ... well, not backed up by much evidence.