I honestly couldn't say, other than to point out that one set of figures was complied randomly, as opposed to one that was looking for a particular outcome.



I DO think it likely that T. rex demonstrated dimorphism - birds do, and crocs do - and they are at both ends of the evolutionary tree of theropods - and we can also be certain they came in two sexes - although the dimorphism may have varied in degree.



My own personal opinion, based on comments by Chris Brochu, who did a lot of the work on Sue, is that the robust morph would be male - because, again, that's the case in both crocs and birds.



That does not, however, mean LARGER - many female birds are larger than their male counterparts - but they are still gracile in terms of bone shape - simply a function of reducing body mass to maximize available space for pregnancy - where robustness is an advantage for the male inter-species conflicts - male eagles, for example, are very territorial.



Peck's rex, for example, a gracile morph, is larger than the robust type specimen, which it is displayed next to.



Of course, we ARE dealing with animals that lived millions of years apart, and could be different sub-species. Not to mention the small sample range. Then there is the fact that the most large, robust specimens tend to be the oldest - so it could also be a factor of age.



As far as the leg measurements go, however, I would say those are the least indicative of the different morphs - the largest, most robust individuals like Sue tend to fall in the middle of Larson's scale in terms of thigh-width - while small specimens like MOR 1125, who Larson defines as 'robust', might simply be demonstrating shorter legs, because MOR 1125 ALSO has gracile measurements in other preserved bones (I think it was the arms).



Anyway, just my two bits.