He probably heard that they are not going to punish Lewis for what he did, given that Lewis seems to be able to do/say/suggest whatever he wants within the team, where as Nico plays good and obeys, he thought he's done what he wanted and time to move on. I think he'd enjoy WEC myself.
As for his replacement - the money has to be on a 1 season deal with Alonso - who, i'm sure, has a number of get out clauses in McH.
He probably heard that they are not going to punish Lewis for what he did, given that Lewis seems to be able to do/say/suggest whatever he wants within the team, where as Nico plays good and obeys, he thought he's done what he wanted and time to move on. I think he'd enjoy WEC myself.
As for his replacement - the money has to be on a 1 season deal with Alonso - who, i'm sure, has a number of get out clauses in McH.