A lot of the drivers were tested at the limits determined by Loyd, Nick M., myself, Sean, Chad, and others deemed necessary without damaging the drivers. These drivers weren't "ours" so we tested them without blowing them (well, most of them anyway...heheh).
But yes, the graphs you see in SPL per woofer were the SPL results with that woofers RMS rated power. Some woofers had more power, others had less power. And for the most part (chime in Loyd, Sean, etc) RMS was pretty close to mechanical power handling for most of the drivers that withstood the 80 Hz on down ported SPL test.