Potential sick Catt questions

[derv88]

I bought a large Catt from Hausermans a couple of years ago for my mother in law.

Took it home today to do some work on it and repot.

I mostly have Phals and have little (zero) experience with Catts, so I have a couple of questions if you would be so kind:

1. What are the "skins" around the leaves called? Are those the pseudobulbs?

2. Are they supposed to be blackish as you can see with my attached photos?

3. The media is pretty disintegrated so I assume the plant has been overwatered. She informed me that the Catt did not bloom this year as it has in the past. Any evidence of overwatering obvious in the pictures?

4. The blooms are a vibrant purple, but the plant has lost its ID tag somewhere down the line. Is there any way to guess what it is specifically?

Thanks in advance!