vaderios said:

IF it was his saber/hand wouldnt be following luke during his vein fall?

isnt the hand/saber was off several time before luke fell?

makes sense?

Not really making sense no. But I'll try.

So if it was his hand it wouldn't follow him because it was off for quite a while before Luke jumped. Unless this is what you said, in which case; we don't know how cloud city works. There's a billion not conceived of cases that could make his hand fall in a different vent close enough to be seen when it falls down, and spend enough time there to only fall after Luke has been hanging around for a bit.

But as the script has revealed it is likely not his hand. Adywan, working on an HD version and all should be able to tell what it is anyways.