Not a terribly strong argument you're making -- Pete's point is that loud, low, and small are generally mutually exclusive. "there are louder, and lower cabs out there, but yes they are much larger". Uh huh!
And it's not the weight that the physics describes, but the size (volume) -- so the 24lb difference isn't important, the fact that folding the front of the cabinet around reduces the internal volume even further is. A cab like the 1210 has a very small per-driver internal volume for an MI speaker.
I have yet to ever see any driver specs anywhere that would allow for 99dB at 1w at 40Hz with only about 0.6 cubic feet per driver (1010 specs, assuming that 40Hz is a -3dB point --
Jorg, if you say 40Hz, that means you've measured it, right? What is it then, -3dB? -6dB? -? I'll be patient and wait for the full specs, if you'll be patient and not advertise half of the numbers that are meaningless without the other half

).