Looking at it from a club/coaching point of view - we have 3 players up front who all lack real height and power, We don't have a 'leading the line' centre forward and maybe the club felt that they need one, just to give the manager an alternative option. If the interest in Haller is true, then we'll have to ship one of our current front players out on loan to make way - Jay would make the most sense, he needs to play regular football and if he gets that elsewhere and rebuilds his career than it's a win-win. He's too good to be sat around on the bench playing rotation with 3 other players in my opinion.
Will be interesting to see what happens and whilst I'll be disappointed to see him leave, as I've always been a huge fan of his, I could understand it from the clubs point of view.