Funny thing is the leaves are actually lighter. Well, let me try and do my best describe it.
All my 2096 and voodoo hybrids have nearly identical leaves as the one pictured in this thread. Dark green markings on silvery background on the upper side, then rather dark wine colored back side.
The individual difference I see on my plants are just the size. Some have bigger leaves than others.
Now, this other one with #3 and Midnight Magic,
the upper side of the leaves have no silver background but the whole thing is just dirty olive green with dark markings that are very dull and slim.
The under side of the leaves are not dark but dirty olive green. lol
Then both sides have just hint of dark wine hue here and there.
The bud is literally black at the moment, but I've seen some really dark bud turning lighter and lighter as they get close to opening up, so I'm yet to see how it all turns out!
Darker leaves are not necessarily an indication of very dark flower as widely rumored.
Some of the darkest vinis I have all have light green leaves.
All vinis have one thing in common though, back side of the leaves, especially near the base of the plant will always show varying degree of wine coloring.