Hi and welcome to the forum
Your first pic is that of a keiki. You can pic that off roots and all and transplant that. It will grow into a whole new plant.
I don't know much about raising keikis, but others here do.
The second pic is a growth of a new cane. Is that the can that is "dying"?
It looks like you have a Phal type Den. They lose their leaves naturally and look "dead". What is your care schedule for this plant? ie watering, lighting, etc...
Phal type dens don't have a dormancy period and require a regular watering and fertilizer schedule. You can check the culture sheet for Dendrobiums at the
AOS website or here on the forum. I hope this helps.