Too Little, Too Late?

[Mevv]

Hi everyone, I'm new to orchid growing, only owned three little seedlings for 3 months now and am finding some difficulty with two of them and would liked to get some help.

My first and major concern is my Den. Draconis. I original bought this little frag with my other orchid Den. Chrysotoxum. The Chyrsotoxum is doing amazingly well, no complaints.

But the reason I bought the two was really for the Draconis and right away after planting it in it's pot all the leaves rotted and died. It was original two pieces when it came to me with the stem that I have now seperate from the leaves. fearing the rot would spread I removed the dead roots from the pot and found to my suprise a small white maggot/larva squirming around the base of the living stem, which had no roots what so ever. Not sure what to do I added some root hormone powder to it and placed it in a new pot of soil and have been lightly spraying it every other day. Is it even possible for this little piece to make it or is it already gone?

Second, is my Den. Christyanum. I believe I may of planted it too deeply into the soil when I first recieved it because one of it's new growths imediately turned black and died after watering and two of it's canes shriveled up and died. concerned I repotted it again slightly higher out of the soil, watered less and it appears to be doing better with one new growth that hasn't died yet. Is there anything to worry about with the dead canes still attached or will it be ok?