I'm assuming this trade then becomes Mirotic and one of these guys three guys since you'd have an open roster spot which I'd prob do depending on your team needs/strengths. Lamb would be safest but Johnson prob has higher ceiling. Monroe in Boston is tricky with Brad Stevens rotations. Based on the match up Monroe could play 25 minutes or 10.

Atm I have monroe (picked him up before he was signed by boston).

I was thinking Kanter is probably overperforming and a slight chance of being traded, so offering a swap for Niko may be a good idea

If you can get end up with niko, do it. Either one of 'em. JJ probably the best pickup from those 3, but he looks disengaged lately, so...