Just cause he hasn't yet, doesn't mean he won't, so don't be THAT guy. But I will admit that you did provide pics to stand by your claim. I have seen many plants that are perfectly green throughout their entire lives. You have to have an intimate relationship with the strain typically though, so you know exactly what kind of nutes it needs and when. Kudos for backing up your claim though Ski. +rep. I agree with Dr. in that most of the time, peoples problems are pretty much nothing, and that the steps they take to fix it, and often causing more issues then they're solving. But he is wrong that plants HAVE to yellow in flower. However it's not unusual at all, and if someone is seeing yellowing of lower leaves in flower, i'd tell them to continue normally and not to stress it. Most of the time (according to Uncle Ben himself) yellowing lower fan leaves are because there's an N deficiency, typically caused by bloom nutes being so low in N. But it's easy to get into an N abundance situation in bloom, which is why most times, it's better to just let newer growers NOT deal with the N def, and just ignore it rather then try to correct it, as it's easy to mess up.