The better/comparative adjective as noun

Are these sentences correct:

1-In a class, the better should help the good.
(In a class, those who are better should help the good.)

2-In a class, the good should help the less good.
(In a class, those who are good should help those who are less good,)

3-In wrestling matches, the stronger defeat the strong and the strongest defeat the stronger.

4-In wrestling matches, the strong defeat the less strong.

Gratefully,
Navi.