Originally posted by h1a8
I doubt it. He most likely got it from some internet site. People also misinterpret things and twist facts up to their liking. That is why it is important to show scans when others don't have the comic.
At the end of issue 432 the writers say Juggernaut's strength is limitless. It isn't a misinterpretation. In the issue where the Evil Trion took over his body, his strength increased pretty fast. Xavier even said Cain would be more dangerous if he knew how to use he power correctly in that issue. He also said his attacks where getting stronger in the Hulk fight.
2 times in 2 different comics Hulk writers have said Juggernaut has unlimited potential. But unlike Hulk Juggs doesn't appear as much nor does he have his own comic. So you are not going to get many examples. In Juggernaut's one shot, D'Spayre took "all" of his Cains power to his knowledge. To D'Spayre's surprises Cain stood before him as nothing but a skeleton. But that shouldn't have happened if D'Spayre took "all" of his power. That is an example of Cain drawing on more power.
But I also see where you are coming from with the, rate at which he can increase his strength. It would also depend on if two characters increase their strength at the same rate, who started out higher. Or if one could gain more power faster then the other. Depending on the story and writer can only give you that answer.