"The fourth assumption is that a recently escaped swarm will build small cell. They will build something in between. For many years most of the feral bees were recent escapees. It's only recently I've seen a shift in the population to be the dark bees rather than the Italians that look like they are recent. Large bees (bees from 5.4mm foundation) build an in between sized comb, usually around 5.1mm. So these recently swarmed domestic bees are not regressed. It takes a swarm from this swarm to build smaller cells."
What MB dosen't include in here is that it is assumed that all bees move into unoccipied cavities, which is far from the truth. They will more often than not move into a home that has already been occipied before. So they inheriet whatever size cell the swarm before drew. They will rarely ever tear down what is already there and rebuild it. So if the swarm before drew cells bigger than 4.9mm, then the new swarm will also be bigger than sc bees would normally be. Which adds to the overall mortailty of feral bees.
"I reject your reality, and substitute my own." Adam Savage