I hate 3CBs, always have. This question is one of the easiest to answer. The worrying thing is that while our performances improved a bit after he was brought in as interim, Tonda seems wedded to the 3 CBs.
The issue is, presently, we have no right backs fit and two left backs that aren't good defenders. Sort that out first. Also our better two CBs this season (low bar) have been THB and Wood, Jack is jack and I've not been sold on Quarshie since he signed. Edwards meanwhile isn't even getting a look in. I think it's hideously ironic that two positions we have quantity (CB and striker) are the two positions that need improving most.