Have to agree, watching Sokratis of late at Arsenal... he's not been great. Manolas on the other hand is doing great on the biggest stage of them all, the Champions League. With Hatzidiakos down, he would be good, but his attitude would need to be just as good, if I am JVS, I'm meeting with Manolas over dinner and having a good chat about what I want in the future.
Stafylidis... simply not a good long terms placement at CB, need to look at the many great CB's we can work with like Risvanis or Lambropoulos, either would be fine next to Manolas.