Alright, I know it's been like a full day since you posted this, but I needed time to properly research for my counter argument. Here it goes:1. This is indeed his fight to lose. I'll explain below.
2. Is this really a statement? Fine, I'll indulge you and prove that his durability is enough.
Has two AT-ST's fall on top of him. Gets up without even a single scratch.
https://m.youtube.com/watch?v=PFK1YmIwgls
Tanks AT-AT blasts:
https://m.imgur.com/TYNSlIc
Gets bashed by an adrenaline enhanced Rancor. Just fine:
https://m.imgur.com/UqvwLpB
Survives being on a whale ship as it literally crashes and explodes on impact with the Executor:
https://m.imgur.com/a/NPTeC
Survives the destruction of an entire weapons factory.
https://static1.comicvine.com/uploads/original/11122/111220339/5125553-vader+survives+factory+explosion.jpg
https://static2.comicvine.com/uploads/original/11122/111220339/5125554-vader+survives+factory+explosion2.jpg
With that said, I'm not sure how Arkady is even going to hit him since he can do this:
https://static1.comicvine.com/uploads/original/11122/111220339/5125548-blocks+flames.png
And this:
https://static1.comicvine.com/uploads/original/11122/111220339/5125550-force+bubble+protects+from+rubble.jpg
And since he's fast enough to block all of these:
https://static1.comicvine.com/uploads/original/11122/111220339/5125590-creates+dozens+of+after+images.jpg
4. And yet in his most recent fight with Deadpool, he solidly lost and was even getting cut up by Wade's completely normal sword. Have you actually read anything with Omega Red in it recently? He's tough, but not nearly what you're making him out to be.
5. Force choke is clearly one of his go to methods for killing.
https://static.comicvine.com/uploads/original/11122/111220339/4628382-chokes+an+imperial+orbiting+the+planet+he+was+on.jpg
https://m.imgur.com/LLog4Hi
https://static.comicvine.com/uploads/original/11122/111220339/5008371-double+force+choke.jpg
Matter of fact, choking people or snapping their necks is what he does almost every time. This is immediately after taking AT-AT fire btw:
https://static.comicvine.com/uploads/original/11122/111220339/4628392-withstands+atat+fire+and+breaks+a+clones+neck.jpg
6. How will the coils reach him if Vader holds him a safe distance away? Better yet, how will the coils hit the guy that essentially was first holding off
https://m.imgur.com/CzS8H8V
And then beating an enhanced version of Grievous:
https://m.imgur.com/a/4HmLN
Or fighting two cybernetically enhanced warriors with 20 years of training.
https://m.imgur.com/a/lSANN
And then having the upper hand even when he gets jumped:
https://m.imgur.com/a/s5zxq
Oh my, is this Vader going for the easy win with tk?
https://m.imgur.com/a/CaLh4
If you want, I can post some more scans or sources, as this has been a very fun discussion, but still:
https://i.imgur.com/tlaq5zU_d.jpg?maxwidth=640&shape=thumb&fidelity=high