Is a research internship senior year worth it?

Looking for thoughts. My DS is a rising senior. He is at the top of his class with a strong GPA, high sat and sat 2 scores, has had summer internships and stem programs, good extra curriculars with leadership and a year long internship in a hospital. The question is should he pursue an research internship beginning this fall during senior year (different one -the other one concluded)? He is going to apply ED to one of the Ivies and has a number of other Ivies plus non Ivy target schools and a few likely schools on his list. He will have a number of leadership positions and activities in the fall and a full schedule of AP classes plus an independent study Capstone research project. Do you think that not having a research internship in the fall will be a negative? Will it really have much weight at all? We’re just trying to balance the workload and adding something else on to the plate.