I've got all of the NF books either on order or in my possession but Cold Wars (which isn't a numbered NF book) is eluding me as is the last Gateways book.(Actually I'm not even sure why I need the last Gateways book at all) 
Are the two Gateways books essential in the NF timeline and experience or are they kind of spin offs? Does Being Human start off where CW left off or can one just go from Restoration to Being Human?

Are the two Gateways books essential in the NF timeline and experience or are they kind of spin offs? Does Being Human start off where CW left off or can one just go from Restoration to Being Human?