CR – There is no contraction: The first Rambam is talking about arguing for fun are just arguing – Hilchos Kavod.
It is not referrinng to Halacha – In fact Shas is filled with places where people argued on their rebbe in Halacha., Hilchois Shgagiyos is referring to Halacha.
CHABAD IS UNIQUE in that NO-ONE will ever consider arguing with the Rebbe in halacha, even in cases where he’s demonstrably wrong (ie sukkah et al). This has utterly destroyed Halacha’s self-correcting mechanism.
Re nevuah: Accurate predictions mean nothing in regards to Nevuah. The predictions must be made AS A NEVUAH with the INTENT TO PROVE YOU’RE A NAVI (I guess hilchos Yesoidei Hatorah you’ve never learnt either?) which the Rebbe never did. If the Rebbe said he was a Navi, he was delusional. Also, if a Navi makes even a minute mistake, he is a Navi sheker. I am aware of many small mistakes the Rebbe made in his predictions. For example, the death of the one yid during the Gulf War is enough to render the Rebbe a Navi sheker if he was indeed a navi.
However, to consider the Rebbe a Navi is utter idiocy, because he met even less requirements of being a Navi than being Mashiach.
Yes Reuven Wolf is a koifer, for beleiving the Rebbe can effect things in this world without Hashem (even if its supposedly with Hashem’s “permission”, he still feels its higher level than Tzaddik Goizer)