Brassia keiki growing over bulbs

[jrguevar]

Hello everyone!,
Today I would like to ask about some keikis that I have which grew at the beginning of this year, when I tried to separate the plant (didn't went quite well, the old section of the mother plant didn't had any active roots, and basal keikis died) once separated I placed it in a container that was too big for the new plant section and it never looked quite ok. Keikis sprouted almost all around (5 new basal ones and 2 over the pseudo bulbs). Now the mother plant is dying and Ive never had keikis over the bulbs so I dont really know how to repot them, so could anyone give some advice on how to handle?... In the pictures you can see one of the keikis is over a dying bulb and the other one has a second sprout in a bulb that is also drying itself from bottom to top, what could I do?...
Thanks in advance!