The near-symmetry of that seat map is indeed intriguing. Although I would expect that single travellers would select aisle seats in general on a 3-3-3 config.
As to the point of unblocking seats - sorry I missed that question previously. I have had them unblock bassinet seats in J before as *G by calling up and saying that I understand the risk of being moved, bla bla. Naturally that does come with said risk, if the bassinet is needed. In my previous comment I was assuming the same would be possible in Y
