SHIG is a modifier only for position changing sliders - try to clinch & go to ground(from standup), break clinch and go to ground(from clinch), standup(from ground). It is even written in the info page. I have had great success with 100% SHIG with a fighter who had takedowns - I could set up 1% takedown attempts(to avoid spamming them and have higher success rate) and 100% SHIG, and if he was struggling at standup, he was increasing his td attempts. SHIG is a nice feature, but it is not how people think it is in their imagination - a fighter changing all his sliders thanks to his IQ. If you set 100% SHIG and 0% tds and 0% clinches at standup, then SHIG has absolutely no impact on the standup part of the fight, seems like that's the case in PBR's fight - he simply had better striking sliders.