Obito can't kamui Madara while he's in PS or he'll get killed
that would take time. and obito is not patient. he will warp madaraanzo's body guards were capable of analysing kamui by bit. Giving of Madara's intelligence feats, he can figure out the mechanics of kamui easily.
not possible. obito can just walk through the mokuton to the source. madara hasnt shown feats of protecting himself with the mokuton. the 5 minute thing assumes obito is stationary and not walking/running in another directionOnce that happens, Madara will keep creating mokuton for 5 minutes contentiously forcing Obito not to only keep going through them,
that would take time. and obito is not patient. he will warp madara
not possible. obito can just walk through the mokuton to the source. madara hasnt shown feats of protecting himself with the mokuton. the 5 minute thing assumes obito is stationary and not walking/running in another direction