Last i checked,obito's "intangibility" worked only by warping parts of his body, shinra tensei affects the whole body,ergo intangibility is useless as the part that is still here will be pasted.
If obito chooses to warp his entire body,then that means he will teleport himself to the kamui land which is longer than warping another person,or intangibility,thus shinra tensei breaks every bone in his body if he tries that.
Thus either way,kamui is of no defence to an ST
asura laser beam from the puppet carries an aoe of a city block,one from nagato will be much bigger,allowing him to easily attack from a distance without needing ST
Rain tiger at will tech,tells nagato which body part is still in this dimension at any point in time,this,accompanied by his sensory abilities,(one which allowed him find kabuto kilometres away despite a barrier meant to disrupt sensing),and his multpile eyes via 2 extra faces and summons and his reflexes,allowing him to react to An FRS at point blank while basically splitting his attention between deva and his main body,means obito is not even getting close,and even if he does,the moment he lays a hand on nagato,he gets pasted.
Obito tricking nagato into using an ST wont work because nagato will know just when he is there and not there,infact,nagato with the rinnegan can see his chakra,thus he can easily tell which body parts are here and whats not.
Also tricking him is futile because an ST will hit obito regardless of whether he goes intangible as it will either
- affect his whole body,thus pasting the part that is not warped or
- nagato focuses an ST on the part still here and still pastes him
also whats obito's counter to the chamelion if nagato should hide inside it?,how is he gonna know when nagato wants to attack?.
If nagato chooses to attack with an ST,obito cant counter,unless he is already intangible before then,cuz while intangibility might be instant,his reflexes and reactions are not,so an instant attack like ST will hit him if he isnt already intangible and even if he is,he will still be hit.
Nagato both scenarios