When dealing with PLD, I think it's misleading to separate Block and Parry. While they are technically different actions, they are both mutually exclusive and do the same exact thing. I think the better stat to use is to combine them into a percentage of attacks which were mitigated by either of them. All separating them shows is more evidence that Block is checked before Parry, proving something we already pretty well know: PLD gets less Parry rate point for point than WAR for each point of Parry because of that shield.