[DF HQ]
I never stated I wouldn't observe him, only that I would keep my distance. Remaining in close contact with him would do more harm than good. He does not know this place or have any reason to trust it. He'll choose a location that is defensible and unremarkable, but I can find him anywhere in the prison.
[That is the benefit of the Sharingan's ability to see chakra. There is no where in this prison Sasuke can hide from him.]
Placing him on the list seems unnecessary, but do so if you feel it more prudent. Protecting the one who killed his clan from the avenger of that clan has a rather ironic twist to it, I would think. My brother has more than just cause to want me dead.