...Lubavitch are basically split 50/50 as to whether he was divine or not...
I hope that was sarcasm! Or do you have Rasmussen poll results?
The belief that the Rebbe was Mashiach and that he was (chas vechalilah!!!) "G-d in a human body" are not the same thing. Many CHaBa"Dniks who subscribe to the former position reject the latter with horror as utter heresy and subversion (which it is).
Those who believe the Rebbe is Mashiach subscribe to one of two theories: that Mashiach will be from among the resurrected righteous (an old Talmudic idea), or that the Rebbe never actually died but, as with Moses on Sinai during the incident of the Golden Calf, the Satan showed people an illusion of the Rebbe's death.
Boruch Ellison is a very controversial figure in CHaBa"D, but while he believes the Rebbe is Mashiach, he is adamantly opposed to the "Divine incarnation" teaching.
I was not aware that Boruch Ellison is even Jewish! I know he’s a bit too kooky for my taste.