https://www.fame10.com/entertainment/soap-opera-plot-holes-that-fans-never-noticed/?streamview=all

The land of daytime drama can be a crazy one at times with plot twists and turns that keep soap opera audiences on the edge of their seats. With many shows that have a long and rich history, past storylines can be changed to suit present plots and, when this happens, there are certainly a ton of gaps within. Below are 12 soap opera plot holes that some fans may never have noticed.

I don't really see John Black's past as being a plot hole. It's just a continuous journey that keeps changing.

The only thing that doesn't make sense is that it is impossible for him to be the father of Paul since he was held captive by Stefano when he would've been conceived/born.