I don't know if you get a chance to watch American Baseball in Germany, or if you have an equivalent... but some ball parks mow their fields in certain patterns just for the visual effect. I think that is what is going on with the first holes of BP. I noticed toward the end that the effect was missing. So, to answer your question, imho... no, the lighter and darker areas make no difference on the fairway, just a visual effect.
And yes, now trees are in play. (ouch).... I need to bring my 3-chainsaw-iron next time.