That's where I was saying in the case of insufficient capacity, the available capacity is divided among the priorities in non-equal but non-zero portions. The SLO/deadline method effectively would be doing something similar as everything would be overdue and the most overdue get highest priority to run. The only difference is that the there's no unequal portioning unless there's additional logic to say x overdue of job A is more important than x overdue of job B, which amounts to setting priorities in the end.