well, many ppl explain pures on another way, and i know 2 of them
1) low defence, high att and higher str, no magic and/or prayer.
2) more hits than combat lvl.
i'd like to go with option 2 since im training to be prayer beast and i still have more hits than combat. and defence of 2 doesnt make sence, cuz there are ppl that like to go with 5 def (steel) or 10 def (black) or even 20 for mithril, 30 for adamantite or 40 for rune (but they wont wear rune plate since you need magic lvls for that and they wont train magic)