Um you dont need fancy or big techniques to defeat someone, a great example is when Minato defeated Tobi with mere Rasengan with the help of FTG. A simple Rasengan defeated a top villain, was that hard to believe as well?
The same way Tobi's mere S/T is enough to defeat Madara. Now if you take away Tobi's S/T then we actually have something to debate. U_U
Additonally:
You talk of Madara needing to exceed the 5 minutes till Tobi is solid again. I just dont see why you cant see the fact that Tobi in those 5 mins has more than enough time to warp Madara away to another dimension. I dont think you have even answered my questioned that I asked, I'lll put it in a way so you can understand.
Question: In that 5 minutes of Tobi being intangible, what can Madara do to actually harm Tobi? U_U