XF in DGSD was well respected in wulin until Madam Ma's plot, in which he very soon became public enemy no 1. His links to the Khitan were enough to restrain the previous fraternal links of those he had considered his brothers.
Would a similiar plot against GJ work - given GJ's background in Mongolia and links with Genghis Khan and at one point even a potential son in law - at any point in the story of ROCH?
I always wondered if demoralisation as a tactic by GWM would have proven more effective. Even if it was not altogether successful it could sow some doubt in ppl's minds - it was apparent how fickle wulin could be and how racist they were (multiplied by 10 when in mobs it seemed).