kishimoto's explanation of tobi's "one jutsu" is simply put, a self-contradicting mess.
basically, as everyone on narutobase already knows, when kamui (and tobi's ability) sends objects from dimension A to dimension A', their relative positions stay unchanged, thus the two dimensions are structured as such that overlapping coordinate systems can be applied:
I. that if kamui warps an object at point A in dimension A, it will ALWAYS END UP at point A' in dimension A'.
Now here's the thing, kakashi, and by extension kishimoto, tells us that tobi's "suction" jutsu is THE SAME JUTSU. if so, then his teleportation (using suction), which allows him to travel and transport things he sucks in (like sasuke and karin during kage summit) across large distance instantly, can only mean the following:
II. while statement I holds true, when tobi warps an object from point A' in dimension A' BACK to dimension A, IT DOESN'T HAVE TO ARRIVE AT point A
Since "suction" is supposed to be the same jutsu as the "intangibility" trick, and we all know how tobi phasing between 2 dimensions is instantaneous, then the way Naruto hit tobi in the last chapter is completely illegit. Let's slow down and see what happens:
Naruto using bijuudama's sheer size to force tobi to phase from his position point A in dimension A, to point A' in dimension A', to which point kakashi sent naruto's bunshin waiting for him. The "smart" thing about this plan is when tobi realized the bunshin's at point A' he couldnt escape back to point A because point A is completely engulfed in bijuu dama: TOBI IS PINNED DOWN. Brilliant right? WRONG!
If suction teleportation is the "same jutsu" as intangibility, then statement II would hold true, meaning tobi can just warp back to dimension A instantaneously but NOT AT point A, but at a random point B far away from the bijuu dama!
In fact this is not the first time tobi's getting pinned down like this. the ambush explosion by konan is exactly the same. but if it's "just one jutsu" like kakashi says, then statement II dictates that tobi shouldn't have been pinned down in either case.
Conclusion: defining suction and intangibility as "one jutsu" is logically erroneous, for it would have rendered both naruto's attack and konan's ambush meaningless.