Maybe he wanted to take the 4th somewhere he was familiar with to gain an advantage? And at this point who else could it be that has the same powers as Madara? I mean he does name drop now, but maybe that is because he knows that no one can stop him now? Where as before he kept his existence a secret. Also keep in mind that no one can know he is alive yet since he hasn't helped Itachi wipe out the Uchiha clan yet,