The masters don't need to be in the direct line of combat but having them all avoid the Greys make for poor character development on their part, and ours. The Greys won't come to us outside of direct illusions. Inevitably unless we directly put them against them due to that reason. At the very least Anderson, for as long as he lives, isn't going to listen to any of the servants and will fight directly himself. 

This is a roleplay in standard fate series unless you're name is Fujimaru chances aren't likely that you won't be marching head first into combat but I'd be a poor GM if I didn't do anything for the masters. More over it'd be direct suicide by servant to march into the Grey's forest directly by herself too far without at least another servant near them. It is their territory too despite Atlanta's affinity this place is what the forest is similar to them as the Eizbern's forest is to them. It is a place they have great control over, and more over as we will be getting to this place isn't a natural forest, and is was created artificially by the Greys. The Red Faction has much more reign to move more so than us Black.

I was going to get to the aforementioned shortly into the IC so the information is not being withheld unfairly.