Quote - I think I understand this now: Genesis didn’t work (as I predicted).  All that texture stretching was a problem. 

With genesis 2, they went the opposite direction, and back to the M4/V4 unimesh concept (I’m not talking about the rigging) with a single mesh that they distort, and then provide different UV maps to us that compensate for the distortion.

So M6 will take G2M morphs but not textures?

M6 is a morph of G2M. G2M is the base figure. M6 has his own UV maps, and when you load M6 his UV maps load onto G2M automatically in DS. 

Quote - Clothing use usually compatible (or fixable) right?Olympia, Lilith, Victoria 6 are ALL different UV maps?  (what a mess)

What about Steph 6 and David 6, to they take V6 and M6 maps?

There is no David 6 yet. Not sure if there will be at this point.

You can use any map of any character on the appropriate Genesis 2 model (male and female respectively). So if you wanted to use V6 maps on the Steph 6 body shape, you can do that. The different UVs may show some stretching in some areas if the maps don't correspond with the body shape. I haven't noticed any problems so far, but I don't have a lot of genesis characters. I have M6 and M5.

You can also get a utility that will transfer UVs from M4/V4 to G2M/F. 

However, if you're porting the Genesis characters over to Poser then you will have to port the figure with the maps you want to use in Poser, as Poser does not currently have a way for you to switch UV maps at will, the way DS does.