What’s his reputation in Germany actually like? He’s not had much in the way of success despite managing some big clubs in Bundesliga 2. A premature sacking in England is hardly going to enhance that reputation if he returns to Germany.
He's got a great reputation across there, very well liked. If he's stitched up ( like he is ATM by the club ) and then sacked, the people who matter across football will know that and his reputation won't be tarnished. Moving across here will only help him imo.