Forgive my cynicism, but I suspect he only went to the counsellor to shut Allison up, and he only played along with the counsellor to shut HER up. I'd be amazed if he ever had ANY intention of doing all those "exercises" the counsellor suggested in her naivety. It would appear to have been a recipe for the disaster that did actually occur - especially if Allison (a) took the counsellor seriously, and (b) she thought that GBC was too.
Yes I'd say that's right too. Playing along and probably frustrated by all these women who dare try to tell him what to do. I don't think he planned to do the exercises but he might have used it to say "times up - that's 15 minutes, stop talking" to Allison. Clearly GBC was not participating in the counselling with any sincerity. It sounds like a crazy suggestion for homework from the counsellor and especially as he needed such convincing but I was just suggesting that this is used by some psychologists as an approach when the continuous questions and grief are causing difficulty.
I don't think she should have suggested this given the little she could have known so far, plus the convincing required. I think naive and a bit of conflict having seen Allison first and probably hearing all about her pain and feeling for her.