>>>Lubavitchers make lots of claims about how gedolim viewed their rebbe; if you want to know what rav hutner held of him, talk to a chaim berlin person.
Or: Read the aforementioned correspondence (google: anash correspondence Rebbe Rav Hutner) and see for yourself their relationship. Also, you will see there the status of Rav Hutner’s “hisnagdus” to mivtzah tefillin.