> And after all that said, no one can still name just 1 / like they name Stalin?

Uh, since I said the list included all three Premiers that were also General Secretaries of the CPSU, that's equivalent to naming Kruschev. (Lenin was before Stalin and Stalin was Stalin.)

> Which is all similar to the various radioactive Plutonium isotopes.

Arguably, in the case of Marxism vs. Leninism, it's more similar to the relation between the abstract concept of a “democratic republic” and the concrete state known as the “German Democratic Republic.”