Grunt Goblin spawns in the Monument

I got on the map Battle of Noctus after the firefight update and noticed the boss refresh they decided to implement. Well I did in fact enjoy most of the new bosses and how they spawned randomly. Then as the final boss spawned; the grunt goblin, he spawned in the Monument! The one base my team did not have. This was very unfair as we had zero chances at the boss. It would be much more reasonable if he spawned on the ground outside of the monument instead of in it. I do not understand this boss placement as it is completely sided with the team who gets the monument and only the monument.