Yes, many United fans saying 'he was backup to Falcao' like that proves Falcao is the much superior striker.. in my mind it's just petty, both are fantastic world class strikers and it's great to have them in the PL. I've been reading up on Costa and his rise over the past few years has been incredible, three years ago he was almost sold to Besiktas but it fell through due to his knee injury. He was loaned out, played out of position, but he kept on fighting and never gave up.