Can someone explain to a new-hire in lamen terms what just happened with 17-01. Looks like to me there was quite a bit of movement across the board going down to ATL?

Is LGA 200 still most junior for FOs between JFK/LGA?
Have they stopped growing JFK entirely?
With all the shifting of folks from NYC to ATL, is it at all probable that reserve times in both NYC bases could diminish further? Not sure what JFK is but I think LGA is somewhere around 1.5-2 months before this initial award.