Jon,
That is correct. If a wrestler is competing in the Park Hill Split Session on Saturday and weighs in on Friday night at scratch weight then he does not need to weigh-in again Sunday for the duals.
If a wrestler does not attend the Park Hill Split Session tournament and does not make scratch weight at the weight he/she is going to wrestle at the duals then that wrestler will need to weigh in on Saturday night from 5:00-6:30pm or Sunday morning from 7:30-8:30am and will receive 1lb. allowance.