It was his only good game to be fair and there is a chance that he fell victim of the DM lottery selection policy that was in place back then.
We are struggling for a left sided defender, i don't see what we have to lose giving him a run of games. We continue to play midfielders and strikers in a makeshift defence when there are options there surely?
The trouble with full back and wing back now it as become a specialist position in it own right in the fact that you are expected to support the attacks just as much as the defence and anyone worth their weight in these roles quite often end up moving onto bigger and better things. Gone are the days where a full back was part of a back 4 and rarely got forward.