Yeah i know he is fast, but there are faster people in the other team, so i don't think his speed would be that great an issue.
The only one I can think of is Gai. Minato and Tobirama have Hiraishin, but their reactions are slower than Madara's while he's the Jin, so if he attacks them, they still might get hit before they teleport away. (Happened to Minato twice)
As for the sage powers i mean what Sasuke said. He said you can hurt the shadow with sage powers. I think of it like Naruto's statement when he hit Jubito the first time with his senpou rasengan( sage techniques works against sage techniques ).
Oh, I see what you are saying now.
So my opinion is that the reason the shadow can't be hit by normal means is because Madara got a hold of sage powers. I'm not so sure in base(without Sage powers), it would still be invulnerable
I see what you are saying now, but I disagree. The attacks completely pass through the shadow instead of just not hurting it. (As seen when Sasuke thew his sword at Shadow Madara) So I'd say its a different phenomenon from Senjutsu only affecting Juubi Jinchuuriki.
Though that shouldn't be an issue since this is Juubi Jin Madara.