I'd say MAN will hold it's own in terms of pax numbers when summer kicks in. STN had tremendous growth over winter and was expected to maybe catch MAN before summer kicked in, but then MAN, on the back of said summer growth, to recapture 3rd...and surpass 25m at some point not too far away.
MAG won't really care which is 3rd and which is 4th though...all the same pot to them.