Just out of curiosity...
Considering the opposition we'll be facing this season (for example, Plymouth, the filth, Millwall, QPR, Preston, Portsmouth, Oxford, several others), how much defending are you expecting us to do in this league, that Bogle's perceived defensive frailties are such a concern?
Against a few teams, maybe he would struggle - Leeds, Middlesbrough, Burnley, perhaps 1 or 2 others - but against most of the Championship, I'd thoroughly expect us to be on the front foot, dominating possession and territory, in which case he wouldn't be doing any defending. If we play a back 3, the RCB is there to cover in case of a counter attack, and with a back 4, a defensive midfielder should do the same.
That said, I do think we could find a more "complete" right back, but that would only he necessary in my opinion if we got promoted again. But considering that would be at least 12 months away, I'd say that's plenty of time to scout out a potential candidate.