They could rename those troopers as the new Crimson Guard
Any new Crimson Guards should be Crimson Guards, not recolored Troopers. I like these guys as red Troopers (NCO's?) and Officers, but not as an entirely seperate class of agent.
That is what my Resolute Soldiers already represent in my collection. It was the only way for me to justify the difference is how they look from the other troops. So basicly, Troopers are Grunts (Pvt - Sgt ranks) Cobra Officers are Lieutenants, and the Resolute troops are Captains. Not sure how much higher the red troops can rank before shouldering in on the position held by Major Bludd.
I actually love the black and red Cobra Commander. I can't see the Duke figure very well enough to see what I want to do with him in my collection. Right now, the first Resolute Duke stands in my collection as a no name Joe.