So Madara's been saying for a long time that the only person who can defeat him is Hashirama... well wasn't he aware that Hashirama could also be revived by Edo Tensei too?
nah i think madara was waiting for them, he has the 10 tails and his mokuton stuff is connected to it, so the 10 tails doing the work of sensing strong and lots of flowing chakra and stuff like that, so thats why i think madara was waiting for them.
Hashirama is not a sensor ninja like Tobirama or Minato! Neither is Madara, So even with the Hashirama upgrade to Madara, there is still no sensory ninja skills in madara!