[quote=@Raineh Daze]
It's not too late to write the Masters out.

Just continue on as if they were never there aside from whatever Master we end up keeping. xD
[/quote]

That's probably the most sensible approach, since I really don't see most, if any of the Masters keeping any important job in the story. Likely it'll require some fixing of the backstory, to accommodate to this change, but that's not something that we can't handle. Retcons are hardly unheard of at the Nasuverse, anyway.

[quote=@VitaVitaAR]
I... feel like this does need to be addressed *somehow*.

I think that we could open a second Servant slot for anyone not using a Master though.
[/quote]

Maybe, but I don't think that it's prudent to throw even more characters in an already slow moving story. More servants may help pick up the pacing, but there's the chance of bloating, so it's a bet. Though, I endorse the idea of switching around characters that aren't being used, or that the player doesn't want to use at the time. Like, say, the chance to switch Servants between missions (not that I think most here would use it but, it being there is already a plus).