Pac has 4 world titles, as in the lineal ones. As Fenster said, no real boxing fans/historians discount the importance of the lineal titles over the ABC ones. Pac has 4 legitimate championships and has fought in 8 weight classes. Those are the ones that only really count.

Another example would be that Patterson is still the youngest HW champ, not Tyson who only won an ABC strap when he beat Berbick, he didn't become HW champ until he beat Spinks as seen by purists.

Lineal>ABC strap.