[quote=@VitaVitaAR]
I'm kind of wary, but I'm willing to accept that it won't be used if GS is. I just hope there will be an IC justification for this.
[/quote]

The justification is written into his personality.  He is almost totally disinterested in this crossover world and its inhabitants, seeing them as inconsequential.  He wouldn't waste so much of an ounce of his strength if there was an alternative.  Even if someone does actually try and oppose him, he'd rather try and turn him or her to his side (via dealing, persuasion, rationalization, offerings, or his charisma) than fight them. Furthermore, he prefers sending subordinates to do his dirty work for him rather than engaging himself.  Plus, if he were to use his stand offensively there's the chance that someone might figure out the World's secret, and that wouldn't be good for him.  That's why that he'd use it only to make his movement safe if at all.

DIO actually has the capacity to be one of the most passive characters in this RP in terms of combat, if not action.  His motivation is not to hurt people or gain control--merely to get back to his own universe to prepare for his enemies.