Part of the problem is that plot wise, we do know generally where this is going. Jeff is going at least try to give Mimi this as a present
, maybe even taking her to Limbo
. Whether or not he succeeds, it will become a symbol of the little humanity remaining in her, and it's going to end up on her forehead.
Despite this, I like seeing GTFO. As it's progressed, it's clear how far "gone" Mimi is. While GT showed Mimi in action, the moments when she wasn't fighting she showed elements of vulnerablity. Here, she seems to be utterly consumed to the point where almost nothing remains of the little girl Jeff helped raise. Jeff had to do a lot of work to get Mimi to the point where she was in GT.