Very much this, I don't think people much know about this. IIRC, it was found that when you have it slotted in Tactics, that it has a chance to go off for you based on how many people are on your team. Just think about that for a second: eight people on your team? Eight chances for procing. And I may be remembering, but I think the effect also extends to any league your on too. How many people can fit in a league? :)
If my build is going to have Tactics in it, it always have a Gaussian's.