A guess at the correlation between Bill's 100sq mm Die and Joe C's 128sq mm Die:
Based on Heat Spreading calculations using guessed relevant Dimensions (not all given in article). Used Bill's "C/W(TIM)"=0.1 and scaled to 0.078125(1/1.28)
for JoeC's(no Spreading).
Looks like it is going to be fun.
EDIT Corrected crappy arithmetic for "C/W(Tim)".