I have been struggling for hours trying to figure out how to merge the hand and the arm in ZBrush (in the red box) so that the topology will flow. Unify mesh makes the mesh too messy and editing the topology manually is too hard since of the complexity of the objects and non-uniformity between the parts (cannot go down in sub divisions either). So any help would be appreciated, this is causing me one major headache.

PS. I have a few copies of the model: body on its own with no hands, hands only and what not.