Risky - The chord you struck is unfortunately incorrect. Do some research here, as firegoat has written, in this thread alone and you will better understand the dorsal thickening and the type of bend that guys with it experience (and elsewhere in other threads as well). There is a difference between normal anatomy and pathological anatomy. Read post #205 in this thread where I describe the anatomy of Buck’s fascia which is the “dorsal thickening” discussed here and in many other threads. It is an investing (covering) layer that is not truly a part of the tunica. It runs the entire length of the top of the penis. When it is tight, compared with the ventral (down side of the tunica of the CC), when you become erect, it is the limiting factor and your penis will take on the gentle curve up that many of us have. That bend limits increased length and is why many of us concentrate so much on dealing with this normal anatomy. This curve runs the entire length of the penis. The tunica is normal.
Peyronie’s is pathological anatomy. The so called plaque in the tunica caused by either abnormal repair of a tunica injury by the body or it can be just spontaneous (idiopathic - love that word). The abnormal thickening can be anywhere along the tunica. It is a very localized (focal) restriction in the tunica itself. This causes a very acute abnormal bend in the direction of the plaque. The size, thickness and tensile strength of the plaque compared with rest of the tunica determines the degree of the bend and the location determines the bend.
Remember who writes wikipedia; readers and anyone can change it. I read threads in it with skepticism and then go to true source materials. Picture #1 you describe is very misleading. If a guy has a very tight dorsal thickening, the upward bend shown can look like this; but not commonly. Even though I am not a urologist, I have seen enough to know Peyronie’s disease when I see it. The bend can be any direction and depending on the factors I described, it can be less than subtle.
Like firegoat,this is just friendly advice.