Mohler's argument is that Sherman was no moderate. He was a theological liberal, and an honest one. His honesty actually helped crystallize the need for a house-cleaning by conservatives in the SBC, which kicked off in the late-70s. (At least something good happened during the Carter administration.)
I can't remember hearing his name prior to the news of his death, but my understanding of history is enriched by a bit of familiarity of a man in the center of a struggle—a struggle involving both theology and politics. Sherman seems to have been one of those unusual people who appear in the midst of that sort of struggle, but who possess little taste for the political maneuvering that so often obscures theological clarity.
About an hour before Mohler tweeted news that he posted the Sherman article, he tweeted this:
It is not the critic who counts...The credit belongs to the man who is actually in the arena, whose face is marred by dust & sweat & blood.That made me think back to the talks Mohler delivered at a Sovereign Grace pastors' conference in which he told the story of the recovery of Southern Seminary. My fundamentalist friend, don't listen if you want to keep thinking of Mohler as a pinko-commie neo-evangelical sliding down the slope to the apostates section of "What in the World."
But since I did you that favor, maybe you can do me one: Next time you hear a fundamentalist speaker tell you about Billy Graham's crusades, AND how they involved Roman Catholics and mainline Protestant liberals, AND how Al Mohler chaired one of them, maybe ask that speaker how many Roman Catholics and liberals were in the Mohler-chaired crusade. And then ask him how many other Graham crusades were like that one in the past 50 years. And if his answer is more than zero, or he doesn't know, maybe you could ask him to check the facts with Dr. Mohler. Just a little favor. Thanks.