Posts: 300+
Activity: 240+ (Sr. Member)
Potential Activity: 480+ (Potential Hero Member)
Its all about common sense to know that a potential account with 480+ potential activity can't have 240 activity with 300 posts
His posts will always equals to his activity until all potentials are eaten up
Are you sure about that? Of course the potentials will be filled if he keeps on posting everyday. This is not my account but I just want to justify your statement.
To explain his account, he probably stopped posting when he has 240 activity and less than 300 posts. He then posted at least once every to weeks to get the potential activity. The potential activity will only be filled if/when he posted something after the account had acquired the potential activity.