Can LotF Luke ragdoll RotJ Vader as hard as he could Caedus?

Can he pin RotJ Vader in place without a gesture and stomp him in a 1v1 lightsaber duel (or force him to retreat) in a matter of about 5 minutes?

Yes or no?

Hard to see how Vader lasts any longer than 10 seconds here.

Like not suicidal on point LotF Luke? 

Vader gets handwaved away. If you mean like the Luke who fought Lumiya and such? He might lose honestly. Luke was a wreck at that point.

Depends on Luke's mindset going into it. If he's serious and not an emotional train wreck, Vader gets stomped like he's nothing.

If Vader lasts five minutes, it's not a stomp.

Yes.