You can find a source for anything you want.
I believe the Kotzker said that ?? ??? ????? ??? is not in agreement with the mishnayos which specify specific z’manei tefilah.
This is not a vindication of that belief, and personally I think that this p’shat in that mishnah is absurd. Rather it is simply to say that if you really try to play devil’s advocate you’ll find a source for anything.
RSRH –
Technically speaking, I agree with your point.
However, how do you then maintain Conservative Judaism to be “michutz lamachaneh”? They too ostensibly work within the “Halachic Process”. For example, they permit driving to shul on Shabbos not because they disagree with Chazal about the halachos of mav’ir, but rather because they believe that the halacha gives Beis Din the power to institue such a takanah k’neged the halacha, and they believe that the CJLS qualifies as such a Beis Din. How is that beyond the pale according to this standard?