XV is a bit of a special case. Firstly the team changed and they wanted to fundamentally change a bunch of stuff. Secondly they had to rebuild everything for the PS4. Thirdly they had to build a new engine. Those all add up to a heck of a lot of additional time required.
If VII only needs to be built the once, doesn't have massive team changes and uses the same engine, that's a lot of time saved. And given it's already been in production for at least a year going from Nomura's comments... optimistic for 2017.