I can make those statements because I know how charcoal burns, I know how the physics work from experience of how long burns last in a certain sized coal basket, I know temp fluctuations in near identical sized bigger and smaller cookers with any burn set up. The laws of physics don't change in the PBC....it's a drum and I'm pretty well versed in them, larger loads of meat still zap up more fuel as does when it's cold outside to maintain the same temps.
Nothing at all against the PBC but none of the laws change in a 30 gallon drum with horseshoes than in something like my mid size cooker or a 30 gallon UDS.
You and other PBC owners have posted all the things you do to keep temp from dropping into a cook. Pull rebar, crack lid, stir coals etc..