“His views are typical of ‘Modern Orthodox’.”
No, the RCA is typical of MO, and Weiss is not very popular with them. The RCA does not accept his “musmachim” as real rabbis. But if you want to find guilt by supposed association because you love to hate, then go right ahead.
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“So if you hold that the Medinah is ‘glatt treff’ there is no way you’ll find any limud z’chus for him”
Weiss is treif because of his destroying the Mesorah and his promulgation of that.
From what you wrote, it seems that you would have no problem that Weiss ordains women and has a Baptist choir in his place, as long as he hates Zionism.