ok the summary for ch79 finally popped out, if you want to wait for the scanlation (which will come soon, i think) don't read this
Spoiler for summary:
the object matsu gives minato is a jinki, it has the same shape as the one got by mikogami and the number 8 is written on it. matsu says there are 8 of them in total and that she escaped from mbi after stealing that jinki; as soon as minato touches the jinki a vision appears of musubi (or maybe yume) with her wings shining,
(btw she says "i'll protect you, i'll always always protect you, my ashikabi-sama") but since she's not wearing anything, both minato and musubi can't tell by her voice and appearance if it's musubi, and to musubi she looks like a different person.
kazehana then enters the room saying it's time to prepare dinner therefore tsukiumi kusano minato and musubi leave the room (to help prepare dinner i think). while musubi and minato are walking in the corridor musubi suddenly starts speaking "it's weird" she says, "the power of the ashikabi in the ancient past..." like she was a different person; in that moment minato has the same feeling he had during the escape plan when yume appeared; when musubi comes back to herself she has no recollection of what she just said.
in the meantime kazehana and homura are in matsu's room and homura is forcing an interrogatory on matsu; then miya enters the room and reveal them that if all the 8 jinki will be gathered together, it will be possible to shut down all the sekirei at once