Usually (but not always) when you see multiple swarm clusters like that, a hive has sent out more than one swarm, each with it's own queen. The primary, largest swarm will contain the original hive queen while the others will contain virgin queens. If they happen to combine into one cluster, the queens will likely fight and only one will survive to lead the swarm.
The queen never leaves the swarm cluster, and has no bearing on the decision of hive location. The swarm sends out scout workers who inspect locations for suitability and report back to the cluster. Through a voting process, the workers decide and move as one to the permanent home.
If you're interested in this topic (which is fascinating), there is a great book on it called 'Honeybee Democracy' by the bee researcher Thomas Seeley.