Unfortunately that's completely incorrect, if Emery was worried about right back (or indeed CB) he could have got someone on loan last month, he didn't and as he said he was happy with his options in defence, so it's got nothing to do with limited options, it's to do with him thinking Lichsteiner. is up to the job, it's clear to everyone else he isn't and shouldn't have been signed in the 1st place, he's also played AMN there when he can't play there.
IMO it's because he seems a bit slow to cotton onto things and doesn't spot the obvious.
Yet he was all too happy to sign a middle of the road player in a position we absolutely do not need at the moment. I'd say Emery is somehwhat misguided.
Problem with this club is they sign players based on cost rather than need.