[tomjen3]

The deltas weren't exactly small either. Change one animation or move one arm a bit and the model file change completely.

And you often have more than one change at a time.

As for two gigabytes not being much I don't think their repos is that small. Most of us would properly have no issue downloading it, but you have to upload them (and DSL isn't symetric) and you have to find some place that is willing to host those gigantic repositories.