The problem here, apart from all the Staff Bo!!ox, is the word 'Enabled'. As far as I understand it, it means that: 'you could have it have it when you need it, but not yet'. That means you wont be able to train with it, so you wont trust it, so you wont be able to use it properly - so it wont bl00dy work properly.
You need it long before you NEED it, so to speak.