Quote - .... What figures have been "shut down" in the past due to mapping?

I'm still undecided on this issue. 

First step should be to simply ask them (DAZ). If the UV maps are not copyrighted, DAZ will know that too, and just give their permission.Even if you do not get a formally written statement, you will know what policy they have.

Quote - The EULA says nothing about uv maps. Texture maps, bump maps, etc, are not UV maps. DAZ only owns the texture maps that DAZ created. 

The point is that copyright is automatic. The license main purpose is to allow you something that otherwise would not be allowed. If something is missing from the license the common copyright law applies. And the DAZ license is (deliberately?) vague about derivatives.

Quote - You do not need access to any daz figure in order to lay out uv maps that will use the same texture maps as a daz figure. Buying any texture map from any marketplace will provide you with the same layout.

Technically this is possible. But even if the texture from any marketplace allows you to create derivatives and distribute them, it only applies to the parts that are original, not to the part that the texture is derived from. If you could make a texture map without resorting to DAZ's UV map or a texture derived from it, then you would be clear to go (probably not possible with M4, but could be possible with UV maps for other geometric shapes, like cubes, tori etc.).

Quote - I think I'm in the clear if I decide to go this route.

The crucial question: Are UV maps copyrightable or not? If they are not, then there will be no problem. If they are, there is someone who has copyright for it. Independent of the fact, if they are copyrightable or not; the most interesting case would be, if you think they are not, and DAZ thinks they are, and you both are willing to fight it out in court. Then the judges will give a clear answer that everyone can understand and benefits from. The community will be very thankful for that :-)