Groucho - 'One cannot impose worldly norms on an Adventist institution. "Freedom of expression" has it limits,...'
Seems your thesis is proven, Dr Taylor.  Groucho doubtless represents a significant bloc of SDA thinking (?) which will defy any continuing search for truth, though the heavens fall.  
Conveniently, Groucho also invokes EGW in support of his view.  It will not be possible to ever grant the GC Pres with the 'ex cathedra' authority of a pope because that role has already been assigned to EGW.  The Reformation's Sola Scriptura has transmuted to 'sola scriptura et albi' for SDAs.
And this is happening at a time when a large and theologically powerful group of cardinals has thrown down a direct challenge to Pope Francis' ex cathedra authority!  They have issued a letter demanding that he withdraw certain things taught in his recent encyclical Laetitia Amore.  Seems they just don't trust the Jesuits!