I am sure Eastern announced last year (from the winter timetable) that ABZ-SYY was going double-daily M-F but they changed their mind.
I think it was because the unit used on the WIC service couldn't fulfil the proposed extra SYY rotation at the times Eastern wanted it to.
At present the SYY is fitted in between the late morning WIC arrival/late afternoon WIC departure.
Again, I think Eastern have said previously that ideally they would want better timings for business pax, which may come eventually, say one morning flight & an evening flight.