there not all as different as you see it.They are held by gravitational forces of the user.So susanno helped him bring the meteor down by gravity this is not an ms dojutsu ability.Ill admit that it makes more sense for madara to be talking about the meteor, but for now i guess he's talking about edo tensei.
Firstly this technique is completely different from chibaku tensei. Secondly its said that the ems gives the user a new power, maybe thats madara's ems power
also if the ems had gravitational power's he could have easily used shinra tensai to block rasen shuriken instead used the next step the rinnegan to use gravitational powers.