Sasuke won't get the other half...it a huge strech to think that because naruto and sasuke are oposites he should get the Yin half. Naruto and being the Nine tails jinjuriki are synonimous with each other, not to meantion the fact that he and kurama have a very special realtionship, they have been together for 16 years. Naruto even commented that the kyuubi was like a parent watching over him. It is incredably obvious that he is NOT going to get the other half. But as for
People seem to have forgotten that the other biju transferred chakra to Naruto via a fist bump. This has been shown with Kurama and with the 2,3,4,5,6,7 tailed beasts. Not sure if it works with humans but it would make sense if the other Kurama can meet Yang Kurama in their subconscious. Since they are one and the same, like how naruto can meet the others in the tailed beasts subconscious and then Yin and Yang can fist bump together and Voilà Kurama is whole again!
I really do think that a fist bump will be all that is necessary, i mean other tailed beats can talk to each other in their "minds" and we know chakra can be given via a fist bump. SO put 2 and 2 together and it makes sense!