the major change in ASI happened in 2007. Since then only minor changes have occurred, expressed mainly in further reduction of volume, especially in OND due to later freezing / intrusion of warmth through the Atlantic side.
Yes, 2007 in some ways had a more dramatic downstream impact than 2012, pinching out MYI classes as well as subsequent volume by the mechanism discussed below. The NSIDC account of Sept-Oct 2007 is at the link below; the overlay of the 2007 minimum on 07 Aug 18 AMSR2 is shown in the attached png.
It looks like most of the 'extra ice' this year will be midway between the NP and Wrangel/NSI. GFS surface winds suggest the peculiar lift-off in the Lincoln Sea will continue a few more days; however a few days of opposing winds later in the month could flatten it against the coast, making the final outline of 2018 ice look even more like 2007.
Delayed freeze-up in the fall prolongs the local melt season in warm-water kill zones and otherwise offer a chance for consolidating winds. This in turn restricts the seed pack to the CAB (recalling that new ice mainly forms on the pack periphery), resulting in an ever higher proportion of FYI relative to SYI.
The second animation shows that ice loss between early August and mid-September is quite variable, with GAC2012 bringing about the most extreme situation in just a few days. Looking at this time series makes me dis-believe the hastily written journal articles post-GAC saying 'oh that ice would have melted out anyway'.
This animation advances in triple frames: first the August 5th for the earliest year, then its September 10th, then the half-overlay of the minimum on the August, pause, then the next triple, up to the 2018 whose minimum and overlay frames are conjectural.
It's also worthwhile to compare each melt season end to its beginning (notably Sept 2017 to Sept 2018) if you take the view that the CAB largely just sits there from year to year (possibly thinning slightly) and melt season primarily consists of undoing undoing the freeze season's new peripheral ice. In that perspective, the year is evaluated by its departure from time-reversibility: did the melt season do less or more than undo its freeze season.
However this year has seen significant inroads into the CAB along the Atlantification corridor, in the Laptev and possibly the Lincoln Sea (where Atlantic Waters eventually exit out the Nares at depth).
While lift-offs are as common and in correspondence with sustained CW rotation of the ice pack (ie anti-cyclonic pressure systems), this one could be unveiling a severely mechanically weakened -- and possibly thinned -- local ice pack.
Recall though the winter Ascat series that showed almost half the very thickest east Lincoln ice getting pushed down the Nares, so quite a bit there is just refrozen matrix, now breaking up into free floes.
Recall too that the interface of the CAB with the outer islands of the CAA was in motion for much of the fall and winter, with huge blocks tumbling end over end and some exiting into a Beaufort-Chukchi stringer. Even though this area might see some of the coldest mean temperatures and historically have been land-fast, in recent years with a smaller rotating rigid body, it is moving fast on the outside of the merry-go-round and coming up against these immovable islands. Much of the very thickest and oldest MYI has been lost in this way.
http://nsidc.org/arcticseaicenews/2007/10/589/#1October