Entirely possible that the two are unrelated. It's also entirely possible that the two are connected.
Imagine, this guy says to his Young fanatic followers "today we're going to go paintballing, it's just like war".
Having worked at a rental site as a Marshall for quite a few years, i've seen more than my fair share of Muslim youth groups come out for a day of paintballing, and take it quite sereiously. We know they were serious Muslims, because they were concerned about the "Animal" parts content of hte paintballs, and the type of food that was served. They took thier beliefs seriously.
What i'm shocked about is the number of replies saying "Rubish" or "The media are exagerating"
It's not really that far fetched, and as paintballers, we have to be aware that at some point people are going to make an ascociation between Rental paintball, and terrorist training. THe fact is that they were training to be terrorists, and were planing to go over seas, and they played paintball. Given that most rental days of paintball are pretty much a "military expereince" it seems very possible they considered paintballing as a form of training.