This seems a little strange to me. 2K in F is the rest seat for the pilot and 13AB and 14AB in the back of the Business Cabin should be reserved for FAs. 13AB and 14AB are Economy Plus seats with an added leg rest and in the past they have the curtains that can be drawn around them. Given the range limitations of the 763 (it can't fly 14 hours) I can't think of any union restrictions that would require even more crew rests (like the 777XP that has the bunks for the pilots then the 8AB seats for meals).