Was wondering where the link between Cocu and Kazim might have come from for this move to have happened, and came up with this theory:
In 2014/15, when Kazim was in his first season at Feyenoord, he had probably his most successful season: 12 goals and 5 assists in 29 league and playoff games, plus 1 goal and 3 assists in 7 Europa League games.
His manager during this season was Fred Rutten.
Prior to this Rutten was PSV manager from 2009 to 2012, during which time his assistant was Phillip Cocu.
Maybe he's a recommendation from Rutten, who had managed to get the best out of Kazim?