Suitably controversial subject, especially for post #1, bravo :)
I note that nobody has yet mentioned structural issues, my first reaction to a situation where close co-ordination is required among a significant number of people (say 4-5+), is to question the coupling of the things being worked on - ask if there are better ways to structure the code so more people / teams can work unhindered (yes, apply Conway's Law!), look for more stable interfaces, domain boundaries, to partition work around.
If short term fixes are needed, perhaps ask if there are known working practices which would help like Mob Coding, or appointing a design authority role to make decisions that affect >1 person (this can be a rotating role, as long as there is someone the team can communicate with immediately for such decisions and they are shared).
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