I remain to be convinced by Costa. He had a great season last year, but his stats before that were not that impressive.
not completely sure of him myself like but...
he got into footy pretty late, joined his first club at 16
his first season at atleti, falcao was the main man up front, think he was used in a variety of ways, the season before that he had 10 in 16 games for rayo.
its hard to not see him scoring more for chelsea than torres/eto'o/ba did than last season. only needed a half decent finisher and he shown hes that last season
should suit mourinhos style as he's a nasty bastrd and really physically bullies defenders