I think it's the role of the lead dev to help newbies and coordinate work if needed. It can also be discussed at some meeting where the PO would present future

I think it's the role of the lead dev to help newbies and coordinate work if needed. It can also be discussed at some meeting where the PO would present future tasks. I don't see that as an intangible rule, it's all project and team dependent. And I see how in a remote world a "standup" can be beneficial.