"One can ask why the Pacific side has started to re-freeze"
It looks more like the ice is expanding/rotating into the Pacific side. Near the center of the ice cover there are desert conditions, bone dry air - freezing winds, whenever a crack opens it instantly freezes over, that slowly but surely expands the pack. As it moves south it loses ground to the planets rotation, about 25k per deg., in order to bypass the CAA shoreline it would need about another 10k. Tidal movement has been keeping the ice from becoming fast, thus every few hours it moves a little further south.
Between the pole and the center of the pack the conflicting pressures forcing the ice in different directions adds to the number of leads to be flash frozen. On the Atl. side there's too much heat and too much wave action to allow the pack to expand, though nothing to stop it's exit through Fram. There appears to be a warm current flowing beneath Beaufort, from the NSI towards Lancaster/Amundsen keeping central Beaufort from freezing, and allowing wave action to continue on that front.
That current seems to be associated with a feature around 77N 172W.
On hycom 'ice opening' it looks to be pulsed from below, possibly connected to tidal surges, creating massive shallow waves which are impacting the melt of ESS On 'sss' it shows up as fresher water/melt I'd expect more saline from below, so is the melt being forced south from beneath the ice? and although it mainly rotates ccw there are signs of counter rotation suggesting two different energy signatures.
This is the last day I expected any downturn so if any of this is relevent the freeze should gather pace come monday.