If true, it is curious that Google would refuse to join the joint bidding team, but there are many reasons to do so, some of which may not be available to the public.

That does not back up your claims. Humorously, the article you linked to, though confusing Novell and Nortel, clearly points out that no context is given for any prior communication (which would be necessary for evaluating your claims of "this was an offer to talk, not an offer of terms"), and gives yet another reasonable argument for why google wouldn't want to agree to a joint bid:

"The search firm might have felt bound by the terms of its "stalking horse" bid, which would let it break up any existing patent licensing terms if it won; it would never have had that option in the winning group as companies with Nortel patent licenses, like Microsoft, would have insisted on keeping them intact."