Robin Propper was heralded as a top Rangers signing when he was confirmed in the summer. The Dutch centre-half was snapped up for a nominal fee from FC Twente with fans delighted to see what was thought of as a readymade starter arriving. The 31-year-old had been the captain of his former club and was brought in by manager Philippe Clement in a bid to shore up his backline having already green-lit Connor Goldson’s exit to Aris Limassol. Propper has now made 13 appearances so far this term but some fans and pundits have questioned his abilities as well as his suitability for the club and the di…