Dofi, a large amount of chabadskers will say that their rebbe just “might” have been or will be moshiach. The anti meshichists, as far as I’ve seen, however, will not say clearly that he was NOT.
And this is why the antis tolerate the meshichists; they’re really not very different,and they respect where the messianics are coming from.
Menachem hasn’t expressed messianism, but he hasn’t denied it either. So give him a chance – will he say that the lubavitcher rebbe was not moshiach, or is it still a possibility?