Iain Walker wrote during an interesting analysis of TWB:
I ameven more confused by their wanting to trap Blake if he is a reformedcharacter.
I don't think they were setting him up as such, but they've good reason to watch him: One, they're not quite convinced the reprogramming will hold (and they turn out to be right); two, they suspect that the resistance will have the same idea and try to win him back, so he's good bait to reel them in.