The intro can use rounded figures, and does not have to have references. The sources are in the lower section. To have these particular figures exactly to decimal places is to display unjustified precision. The use of the word "about" signals a rounding of figures. This is absolutely proper given the wide estimates of different sources.
There is no justification in giving the estimates of any one expert priority over the others. Having said that, it is clear that the estimates of size have come down somewhat in later publications. In respect of weight, editors must bear in mind that this is the least easy statistic to estimate from skeletons alone. Over-precision is a fault: estimates are only as good as the methodology. Macdonald-ross (talk) 11:45, 18 October 2014 (UTC)