Which is better, Knight or Serpent Cataphract

[Omnirizon]

on the units whose mounts live on after the rider dies:

1. cave drakes are cold blooded, yet with a rider they do not show this quality. bug?

2. will a cave drake commander unit (or any similar unit) whose rider dies remain a commander. So a cave drake rider dies, do you get a drake commander? I mean that would be kind of weird.

soldier: "sir, the enemy calvary is falling in on the northern flank! what are your orders?"

cave drake commander: "raaawwwr!!!!"

soldier: "of course sir!"

cave drake commander: "Rawwr, rarwwwer, rawr. RAAARWWWR!"

soldier: "YES SIR! LOUD AND CLEAR!"

cave drake commander: "raawwr."

soldier: "of course sir, we will save you one of their legs for dinner tonight"

[Tuidjy]

I think you end up with spiders commanders from Machaka's knights. I know I have
charmed some when fighting against them, but it may be because of a Charm quirk,
i.e. not working as designed.