The operative word here is "requires". If your running in the 10s you do not require a cage and therefore even if you have a cage a window net is not required. If you run a 9.99 you are "required" to have a cage and there are also "required" to have a window net. as mentioned above the exception is that if you run 135 or more in the 10s then you must meet the same requirements as if you were running in the 9s.