I don't think D Brooks is what this team needs although he would not be a bad replacement for G Will should G Will leave.
This team needs shooters. Guys who can consistently make outside shots. Not a less consistent more shot-happy version of Marcus Smart which is what D Brooks is.
Still, his defense and mentality would be good for the squad just it has been for Memphis. So not a first option but a decent fallback option if other things fall through.