I really don't know for sure. At the end of the episode "Cargo of Doom," Denal's voice sounded like it wasn't a clone. And then in the beginning of the next episode, "Children of the Force," it was revealed that Cad Bane disguised himself as Denal. Personally, I think the real Denal died when the Separatist frigate exploded in "Cargo of Doom."
I'm not sure yet, but iff you look at the Star wars the clone wars trailer for series two there's a quick snap of Cad Bane WEARING Denal's amour in a ship trying to get away. It's your opinion. Really you need and wait and See for your self. in cargo of doom you see sgt denal get on to the shuttle and he has a deeper voice so cad bane might be in in denals armor Denal was mistaken for death and while the ship was blowing up he was shot in the right upper torso and fell he then ran and found an escape pod and landed on Courascant. Hope this helps. From what I know he lives.
Koho probably did die, either by Cad Bane killing him like Denal or knocking him out and the ship exploding with Koho in it.
he gets killed by bane
No, he does not I have not seen the whole Season 5 but he is probably busy in that Season after all he is an ARC trooper. He is in a Season 6 trailer and that means he couldn't have died.
No
Dengar didn't die in The Clone Wars. You might have it confused with someone else
The answer is yes
mr pink
No, he is alive in episode 3, so he must live through the clone wars.
Echo did not die in clone wars he showed up in season seven
"Orders"
yes