So, re-treading some old Englehart stories (Who I suspect is a pedo-bear base on his fixation with pre-teen Arissa getting ringed into a woman and getting paired up with Jordan), Kilowog designed the Rocket Reds himself, using his ring and his knowledge as a scientist/engineer, in conjunction with a Russian scientist.
The most definitive feat is probably a test where a Red fires a full power blast, and this exchange:
"OW! I felt that, poozer!"
"As did I, comrade. Five such blasts would fry the armor."
"That's too bad. But my first love is a genetic scientist, and I know when you hit a physical limit, there's no pushing past it!"
So a single Red can hurt a GL, but not defeat them.
And about six can take down two, as they had to John Stewart and Katma.
So, depends on how you figure Crimson Dynamo compares to one GL, and if you think even half a dozen of them can defeat one.