Grimgar vol 13 part 6 is the same section as part 5. Not sure if this was an accidental double post and only part 5 should be up or if part 6 needs to be posted still.
It was just posted by accident with all of the schedule changes.
Part 6 will come out January 14
Sorry but J-Novel Club does not publicly comment on any potential licensing decision or acquisitions.
J-Novel Club, Future Volume Release Schedule
Premium Content List