I think it was more disappointment after establishing himself at Roma he didn't go to a better club in Italy, Spain or England. Zenit not playing in CL this season so he's lost that standard he had at Roma.
Still wouldn't write off Wiggles but I do think he may need to leave BVB,or even Germany,to get back into showing his promising previous form of a couple of seasons back.
Think he'll do well in Italy under someone like Allegri or Carlo Ancelotti.
He is playing in defence these days, despite Dortmund having 2 fit central defenders, Favre sticks Weigl in there
Thing is, he had one really good season, and that was it, but he did suffer a really nasty injury , a fracture-dislocation of the ankle, like the one Everton player Andre Gomes got.
He isn't a CB and never was. This is on Farve, had both Zagadou and Hakimi fit on the bench but choose to play him there. He is a CM and is pretty decent there to be fair.