That works best with dive comp afaik where the Genji and Tracer won't be as healer reliant. This leaves the healers free to be around the tanks. Dive in general isn't a healer reliant comp tbh. Fights are over quick and the tanks get in and get out and don't take any sustained damage for long periods. Lucio is good for engaging and pulling out boosting at each time. And Zen with Lucio's aura works at restoring health pre and post dive. Either way, it's gonna be a super offensive comp and your primary focus is on getting strong picks before your tanks and dps get too low and have to either back off or end up dying.