Actually, C&C3 was on SAGE/W3D engine, just like Renegade, Generals, RA3, and Twilight. It's just that RA3 and Twilight used a more heavily modified version called SAGE 2.0. Command and Conquer never got a new 3D engine until the now canceled Generals 2, which ran on Battlefield 4's Frostbite 3 engine.
and is still a newer engine then when a grenadier was last seen which was tiberian sun where the disk thrower can still perform that same glitch, there was a reason no grenadier unit was done for red alert 2