Mt Whitney Zone Forums General Discussion Communication on the Mountain?

Hey all,
I'm part of 10 person group is training to do a one day summit in September. We are thick into our training, and some questions have come up around if / how our group might split up. We did the (steep!) Bear Canyon route up Baldy this past weekend, and ended up splitting into 3 groups with slightly different paces (we summited within an hour of one another, though).

We have varying opinions on whether splitting up on Whitney is a bad idea, esp if people get altitude issues and need to turn back.

Is using walkie talkies on the mountain possible? Or are there any communication solutions people have used?

Would love some input on splitting up vs. sticking with the slower groups, or other group norms people have found successful.

Thanks!