In order for Aragnis to pick up RH, ToT, Grace, AA, Aton, & Insp, he had to forgo both 3/3 IS & 3/3 Darkness. Thus it is difficult for us to utilize his log for our argument, which is the benefit of AA/Aton/ToT vs. RH/Grace/Insp for a raid healing priest. Aragnis' spec is obviously viable, though clearly I value the intangibles of IS and the baseline increase of 3/3 Darkness while raid healing more.
So, lets look at each independently. For the sake of argument, lets throw ToT & Insp out the window for now. What we are comparing at this point is the benefit of AA/Aton vs. RH/Grace.
Now, lets look at Aragnis' Penance and GH casts, which obviously were also affected by AA, but i'll put myself at a disadvantage and attribute it to Grace/RH. These two spells combine for [547914GH+490773Pen] 1,038,679Healing or 16% of Aragnis' healing for his parse. We'll tack on another 166,000 worth of Aegis bringing the grand total to 1204679 or 18.5%.
Atonement was 5.6% of his parse and his AA uptime was 20.9% of a 10:03min fight. So, lets put my side of the argument at a detriment and say that Aragnis blindly clicked AA on CD, meaning we can take his overall healing done [6,489,030Healing] and say AA increased it by 3.14% overall, add in 5.43% from Atonement[minus average bonus from AA] and say that, in total AA/Aton accounted for 8.57% of Aragnis' total healing, or 556,110Healing.
Therefore, in order for Grace/RH to have been more effective than AA/Aton for this particular sample, it would have had to boost the numbers of Penance and GH by 46.16%.
Lets go a step further and say my quick math just isn't indicative of the entire picture. Sure, I agree that I could have adopted a more detailed model. Lets say I'm off by a whopping 15%.
Would you go so far as to say that RH & Grace are capable of representing 31.16% of the total healing done by Penance & GH in this parse?
I will respond to the Inspiration portion of the debate in a following post as I don't have time to properly address it tonight.