Stratford Ticket Gates

[Mojo]

I was at Stratford yesterday for the first time in ages and was observing things from the 'balcony' up there and was looking at the 2 sets of ticket gates.
From what I can see, people from the Jubilee Line have to go through one set of gates, up and over the balcony/bridge, down the steps and through another set of gates to exit.
Is there another entrance/exit to the station that I missed, or is there some other reason that there are gates to the Jubilee Line.
What about those with single tickets, & Oyster pre-pay?

 

[Tom]

The Jubilee Line area is owned by LU and therefore has ticket gates as it is a compulsory ticket zone.

The rest of the station is owned by Network Rail & 'one' and does not have ticket gates as there is not enough revenue to commit the cost to it.

 

[Mojo]

So where does the exit over the other side of the NLL from the Jubilee Line go?

 

[Tom]

No idea, only know that (don't personally live near there).