Question about the Gx CS 2

I'mguessing you mean a change was made when they went from oil to no oil in the crankcase?

I looked at every picture i could find online of the current dry sump compressors, even ones advertised for sale, and they were all over the place, but the majority were blowing in.

I'm wondering if it matters???
Yes, it matters. The cylinder itself has been revised over the years. Some have holes in the side, some have the bottom of the cylinder open. Others have intake holes from behind the cylinder head. Cs3 has changed as well over time.

The cs2 and cs3, and the cs4 use a roller bearings, they do not need oil that has to be changed all the time.