Correct me if I am wrong, but wasn't last season the first season that Biglia played as the solo holding midfield player in his career?
Most of his career he has played in double pivots alongside a DM as the sort of South American style midfield duo where the 5 is not anchor but a traditional DM and the 8 isn't necessarily an attacking box to box player, but a simple short passing link player.
That's what I think Biglia is, the South American 8 who plays better with a midfield partner who plays closer to him. Maybe we can try Biglia with Montolivo as anchor in a double pivot system, but not both of them together in 3 man systems.