It wasn't removed because T's couldn't rebel on it , that makes no sense really.
Jb_casper has 2 doors which are easy to watch from above the cage , even if you get away you won't be able to go anywhere , that's where brains and teamworks comes in , wait till they do a command which can get them killed , or wait until they get off guard. (Best timing is when they will you to follow)
Jb_snow for example is easy to rebel cause there are 3 doors , once a T gets passed those doors he has so many places to choose from and can go get a weapon , and I think it's good that snow wasn't in the rotation last month.
All the maps look good and are similar to jb_casper.