Jeeez, have you not learnt that everything in wrestling is bullshit? The tape measures will be fake and the heights and weights hugely exaggerated. You can see in the Rock 3 pic that Hogan is obviously on a box or he would have the longest legs in history, look at where his waist is. Dude is prob 6ft 3 / 6ft 4 at his peak with 18/19" arms, now about 6ft 1. Sly is known for wearing lifts always, he's 5ft 8 max.
He wasn't no 6 3, he looks that now, and can tell you he has lost tons of height, besides that, he was billied as 6 9 not 6 6 in the wwf, he wasn't that tall by no means, but he was closer to 66 than 6 3.