Yes. Or did a hive swam and later another one or two swarmed and joined the first swarm already hanging in the tree?
I think the really large swarms we see are absconds or even primary swarms. My largest seem to be early or late summer, which to me would point towards an abscond.
Something really huge this time of year could be a very large primary swarm or an abscond.
Most people tell me the swarm cluster we see now was bigger yesterday, so they seem to lose bees more than gain them as the days go on.