based on my own guesses on how many title defenses each person had based on what era they reigned in....
If Bruno Sammartino defended his title a whopping 2 times a month, he would have roughly 192 defenses if you rounded his reign up to 8 yrs
If CM Punk defended the title 3 times a week, he would have (at roughly 62 weeks) 186 defenses
If Hogan defended the title 3 times a week during his 1474 day reign, which would be roughly 210 weeks, he would have roughly 631 defenses.
I would have to say that chances are Backlund and Morales worked similar schedules as sammartino, so no need to do the math considering punk's reign is comparable to an exaggerated version of Sammartino's reign. In fact, Sammartino's number of defenses is likely much lower than the embellished number I came up with. Here is what I believe would be the most logical top 4 for most wwe title defenses during one reign of all time....
1. Hulk Hogan
2. CM Punk
3. John Cena
4. Bruno Sammartino