Good point with the communication. I am afraid it is not obvious for everyone - knowledge sharing. What is your suggestion to encourage guys to share? Some, I guess, are afraid of being .. replaced :)
Leading by example helps - documenting everything you work on and presenting overviews to the group when possible. Changes to on-call can help too. "If your stuff isn't documented, I'm going to call you instead of troubleshooting on my own."
We're a place where coders share, stay up-to-date and grow their careers.
We strive for transparency and don't collect excess data.