I'd argue that Karen is less of a front-runner than either Ashley or Mirai considering her VERY poor performances as of late, especially at Skate Canada. She can still turn it around at SkAm. But she's probably in a more favorable position that Mariah or Courtney.
Exactly - While Chen may have a bit more to prove than Wagner* or Nagasu this season (she needs to trend in the right direction!), no one else is making a clear case over her at this point. Remember, best of the worst as I said earlier...and also keep in mind for the Committee that Chen was 4th at Worlds last year. Now, of course if she stinks it up at SA that may very well be negated.
*Wagner also needs to step it up at SA to keep herself in position
Disclaimer: Preliminary assessment - will change as we get deeper into season