No, a simple unweighted average of Patcherk Single-Target, Patchwerk Double-DoT, Helterskelter Single-Target, and Helterskelter Doubt-DoT is being computed. No fight in Firelands matches any of these four types of sims exactly and, likewise, different strats call for different tactics by SPriests (and sometimes vastly different, even in the same encounter). With that being said, these stat weights reflect an average of pieces over all of the types of encounters you'll face. If someone wants to try and figure out the ratios of these 4 sub-types within each individual fight to try to maximize gear on a per-figth basis, I leave that as an exercise to the reader.