How is there any variation? SI:7 being there first doesn't somehow conflict with the league being sent in at a later date to research azerite and being attacked. I'll go ahead and point out again that even after the goblins attack the Alliance, SI:7 still shows zero evidence of attacking the Goblins.
Do you have any evidence that the spies were butting heads with the goblins before that attack? I doubt it, since the only thing we see about SI:7 between Shaw passing off the sample and the league being sent is the cinematic, wherein we see that SI:7 is keeping their distance. And since Nathanos, during the Horde quests, specifically says "IF you see any Alliance kill them", and the main Horde camp is only getting reports that there are Alliance around. It seems highly unlikely anyone was doing anything at all to the Goblins.
Especially when you consider that the goblin attack has absolutely nothing to do with SI:7 or "vengeance".
So again: Do you have any evidence, any at all, to suggest SI:7 has done anything wrong? Because we have a whole lot of sources saying they were sent there to observe the sword, noticed goblins, and then did nothing until fighting against the Horde player long after the attack on the explorer's league.
It is cute that you walked back that goalpost from SI:7 are murdering goblins to the already completely destroyed "S-SI:7 were attacking the Horde by happening to see them while they were investigating the sword!!!"