Technically you could have, say, Cuba with Trump as president. It would be farcical, but one person alone is not the system.
If Trump, as he is now, becomes president of the system, then that means that the system is likely in great crisis or decay.
As for communism having dialectics, that's not the right conception of dialectics. Dialectical materialism is the world outlook of communists, not a feature of socialist/communist systems.
Well, if dialectical materialism is used to reach communism, it will still be taught to handle other issues and maintain communism, right?
Would it be less needed after class contradictions are resolved? But there maybe other contradictions remaining, right?

It may have seemed like that since you were not the commentor who I was replying to and did not follow the comment chain. And I did ask if it would be better to term it as 'poisoning the well'.
But ok dude, you do you.