To be honest I have been going through a lot of things on a personal level - esp with work related stuff. While much of it has worked itself out externally there are still a lot of aftereffects. About 20% of the workforce were really hurt by the shenanigans that went on, myself included. None of us are quitting, and the folks in charge now are very fair and good to us all (in a balanced way, too), but wounds are wounds and take some time to heal over and work themselves out.
We have been doing a little re-shuffling at work to make things more efficient (and in some very reasonable areas too), so things have been busy.
Have been mulling over my "top 10 of the tear 2012" for a few days now, tbh.... Already chimed into the "fave OP and ED of 2012", the "biggest disappointments" and "most pleasant surprises" threads. This has helped clarify my thoughts a little bit at least.
As for Irisu only taking the blame, yes - I agree with you that Hongou is partly at fault (with her I see it as a weakness and an unwillingness to speak up that led to causing others problems), and Tomoe is definitely partly at fault. Tomoe is someone I don't really have a clear read on yet, to be honest - though the remark of how Irisu could possibly make Oreki dance on her palm irked me.... Many of the thoughts on Tomoe were on the wall post you mentioned earlier.