User blog comment:Aicilespear/Some recommended sets of SP for the Six Heroes (and perhaps more)/@comment-26626470-20160425024009/@comment-26347196-20160425024923

The idea behind nuker Vargas is to make him a specialized heavy hitter, since his spark/crit boost is really niche and outclassed (80% spark buff when Charla has 100% buff already; 50% crit buff when Charla has 75% buff already). In a dedicated Spark or crit squad, the buffs don't stack, so I'd rather have only one buffer with the most potent buff, and then have everyone else being nuker or other supportive roles.

Also, thanks for your compliment :)