Second Grow - Dutch Passion and Freebies

The two more developed plants are really starting to fill their trichromes. The top flower on the front right Moby Dick is the biggest in the tent at approx. 3.5 inches in diameter, appears very dense, and still smells sweet and floral. I'm beginning to believe both Moby Dicks are in fact the same plants, but one is definitely an odd ball. You can see in two of the photos of this week that there's one stem on the rear Moby Dick that is putting out much darker green, almost shiny flowers that look identical to the front Moby Dick. I'm a new grower but is having a single stem on a plant that's different than the rest of the plant common? The front Moby Dick despite being taller and less bushy is covered in the darker green, thick leaves that are almost shiny under the lights.