could this fracture have originated from a (possible)methane hole which showed up in October?
No, and I advise you to be wary of anything that originates at that blog. What they very often do, is make a mountain out of a glitch or artifact on some graph or map (usually those from the Naval Research Laboratory, which has had problems in the past few months).
And how could it be heat from some volcano on the Gakkel ridge? It would have to well up through hundreds of metres (kilometres?) of water, and the halocline and everything, and then end up right there in that 'small' spot? Impossible.
The crack is sort of interesting but it's more indicative of the changing weather patterns over the ice at the moment.
Far more interesting is the way that the consistent low pressure systems south east of Greenland over the last month have contributed to sucking ice through the Fram straight.
I agree. The crack on AARI is interesting because it's so long, because it's not accompanied by several other cracks, and because of the time of year (I've seen those pink cracks before during cracking events). But it will probably be gone on the next AARI Ice Analysis map, and have very little effect on the ice (if it has, it's probably thickening it).
Transport through Fram on the other hand, is usually bad for MYI.