Here's a thought what if he decides he'll go find where naruto is cause i believe that he wants to fight naruto himself and extract the kyubi from him,i know it may sound far fetched but just think about it when madara was summoned on gaaras battlefield judging by what madara said about edo tensei being an abomination or whatever he said must have heard about the technique but we never expected that he would possibly know how to remove the contract thus separating himself from kabutos control he might even know how to perform the technique itself so what's to say that he doesn't know how to extract the kyubi from naruto and well if you think about it kurama was madaras pet or you could say his toy and well madara doesn't seem comfortable with the idea of naruto whom he calls a little brat being the kyubis host and i'm guessing now madara's back he might want his pet fox back.