Welcome to the forum!
It's more a question of timing rather than of priority.
The two processes are independent of one another, and each has its own timetable.
Admission authorities should continue to operate their waiting lists as normal. As ToadMum rightly points out, they are not meant to stop admitting from the waiting list to make room for the possibility of successful appeals
Year 7 allocations are usually done in batches until things have settled down. (For example, after the initial offers at the beginning of March, there is usually a second round of allocations in April.)
Places can only be allocated from the waiting list if there are vacancies.
Appeals are different, because an appeal panel can admit children over and above the admission number.
This can impact on the waiting list, even though the two processes are separate.
See the example in C17:http://www.elevenplusexams.co.uk/appeal ... school#c17
Have you appealed? If not, it might be worth trying a late appeal.