Xabi Alonso should simply seek for new managerial position because his team flops in big games and in tougher positions this season. You do think he's happy with the club's stats?
He should be.
If you compare them to the last season, then they might not look that great, but, objectively, the club is doing really well. They still have theoretical chances of winning the league, but even if they don't, the 2nd place in the Bundesliga and reaching the round of 16 in the Champions League is not something to be ashamed of.
The previous season was exceptional and it was pretty obvious they won't be able to replicate that success this season.
But I feel Xabi Alonso may accept an offer from a bigger club if the opportunity arises.
Well... How quickly people get used to good things, don't they? Before last season in Leverkusen, even the most daring optimists did not dream of a title, and now some are unhappy with second place (with a theoretical chance of winning the title).
I think Xabi doesn't necessarily have to look for a new place, because in order to get promoted, a place needs to be freed up, of which there are very few, literally a few clubs in the world. There is no point in moving to a regular club, he still has room for progress at Bayer.