One of the most important things to make sure your team is progressing together at an even pace is knowing where everyone is at with their breeding.
Are they using a Breeding Guide?
Are they doing their dailies to have their breeders ready for the next Breeding Event?
Are they doing their Egg Missions so they have enough tokens to progress at an acceptable speed?
Are they over-leveling their base?
Knowing the answers to these questions will help to figure out if players are falling too far behind. Seeing what dragons they have bred will help to give us those answers. We can dole out advice and requirements until our faces turn blue, but knowing whether our players are following what we tell them or not is hard to determine.
Tracking progress is an ongoing task and it is much too tedious to constantly have to ask everyone where they are at. Can we have a button added to our teammates through the Meeting Hall that allows us to see inside of their Dragons Den?
Edit: It would also be helpful if we could see Egg Token counts.