does it make it seem more likely it was a controlled ditching?
Not really. You could say the same about this piece
At least both pieces are not consistent with an high speed impact of an intact airframe. To tell an inflight breakup from a controlled ditching is not that easy if you just see single pieces.
A gone trailing edge with a largely intact torque box is not very likely for an inflight breakup. The intact torque box alone could fit that scenario, both do make a high speed impact relatively unlikely, but such events are always somehow random, so a single piece does not tell too much.