It seemed to me that there was evidence to suggest they were dwelling in the abandoned parts of the mine prior to the Turngait breakout, so I don't know about them being infected. However, they do all appear to have abnormal sores of sorts.
I think if you really nitpick at Penumbra you can find minor inconsistencies in the timeline...but really, it's not too hard to reach other plausible explanations.
As far as them being identical, how about for time's sake in the 3D modeling department?
(05-04-2011, 12:55 AM)Tanshaydar Wrote: They bred?
Yup.