The issue is not with finding perfectly matched contestants, but if you see now, all the contestants are at least comparable in their dance experience and presentation, each with advantages and disadvantages, while Isha is on a level of her own, with no disadvantages in comparison. The rest are of a level where they are legitimately competing with each other, while Isha really has no competition. Her consistent 30s reflect that the judges are in no real position to judge her because she is well above and beyond their scale and capacity for judgment.
Don't get me wrong, I am thrilled that people are getting to see the calibre of performers out there, but I fail to see her place in the competition; she is simply not competing with the rest.
If you think Isha's training is comparable to that of Jayati, GC, Pratyusha, Darsheel, then you are really insulting her life's work by reducing it to the equivalent of a few classes a week or a hobby, pursued alongside a "real job." Unlike the other contestants, dancing is Isha's "real job," and it makes a huge difference to the way her performances come out.