I believe in Mkhitaryan. If he wouldnt show his potential by now I would definitely be more worried. By after seeing this performance:
http://www.youtube.com/watch?v=UTiLlNZcObYOr the one against Schalke Im convinced he is not just some average player, he really knows how to play at top level and I believe in him.
Biggest rumour of the last few months - Bild informed recently (for the second time I believe) that we are strongly interested in Diego Costa. First time I heard about it I laughed really. I dont know, I just dont see a player of his caliber joining us, Im not used to it. But it is technically possible, his buy-out clause is 38 million euros, definitely affordable for us after making it through to the knock-out phase and with good chances of playing in the quarterfinals.
Anyway, its highly unlikely Diego Costa will join us but if he does I will definitely forget about Lewandowski fast. This guy might have a bad temper sometimes but he is a hard-worker and a great footballer. Would be awesome to have him. Management knows we cannot underestimate the threat of Lewandowski's departure. We need to make sure we have a top level player as a replacement.
Anyway, I believe we will have much stronger second half of the season. In Champions League it looks like we should be able of reaching the quarterfinals at least. In Bundesliga we should be able of getting the TOP3 spot at the end. There is also DFB Pokal. There is still a lot to play for this season and it still might be a great campaign.