The Astana search is a mistake. Sueddeutsche Zeitung is wrong here.
The Sueddeutsche Zeitung journalist just quoted a twitter message from another journalist, who was doing a joke. This other guy wrote sth. like "Police also at Astana hotel. But they just look for wrongly parked cars before the hotel".
So forget about Astana in this case.
Concerning di Gregorio, if someone would have asked my this morning to give a guess which Cofidis guy was arrested, I would have started to think about either di Gregorio, Taramae or Mate. Just my personal suppositions.