You don't really need to worry about the 4th mortar yet. If you are like me and just gonna keep upgrading your mortar until it is caught up with the others, then you won't even use your mortar for about 2 weeks (th 8, lvl 6). By then, updated base designs should be out for your base. I'm not going to incorporate it into my base until it is finished catching up.



. However I am in the verge of adapting to the situation and planned something for the fourth one, lets see if it really works, I shall share my experience later.
