Before this thread derails further...
I'm bumping a selection from my original post in the hopes of getting a response to the question I originally asked regarding the best glyph options for a raid-focused holy priest on H LK 25. The other information from that post regarding group makeup was provided to offer a picture of our current healing synergy.
Other comments regarding "you need 2, no 3, no 20 disc priests to complete this" with thoughts behind them are not unwelcome, but I have an inkling of how to play disc already having been main spec PVE disc since late BC, and am aware of the role it plays on this encounter - and the extra layers to the security blanket against infest that can be added by additional disc priest(s) included in the roster.
But after you reply with off-topic comments, please consider addressing the original request