Hmm. Interesting. Three possibilities abound - that he's been tapped up by a richer club, he's had disagreements with the management and board over signings or he has some personal concerns he wants to focus on. The first and last aren't dangerous in any way, but the middle prospect is. And if there are disagreements, then the question arises as to whom those disagreements were with - Poch, or Levy? Substance of the disagreement probably changes in each case - perhaps with Poch it's a case of players he recommended not being integrated enough, while in Levy's case it might be that players he recommended are being passed up in favour of cheaper or different alternatives.
Either way, further developments will tell us more. The period of recruitment that he was at the club for has been a generally successful one - significant failures, yes, but overshadowed by the successes. If he forms a significant part of that phenomenon, then it's a shame he might be leaving.