By Tom Victor & Oliver King Rio Ferdinand insists Mauricio Pochettino needs to be given more time at Chelsea after the club’s transfer policy has valued potential over ready-made talent. The Argentine named a youthful XI to face Arsenal on Tuesday night, but it backfired in a 5-0 defeat at the Emirates Stadium. Former Chelsea star Kai Havertz scored twice, as did defender Ben White, with Leandro Trossard also on target for the home side. Chelsea have spent huge sums of money since Todd Boehly took over as owner, but results have suffered amid significant player turnover. The London club finish…