How to win with a “weak” Knight?

By the way, in "Good and Evil," the Knight had very convincing online builds in 2008.

For the Knight against the Warlock, the only chance is to rush with 6 Paladins and all available troops on the second week, and even then, the Warlock can outsmart the Knight's army quite effectively.
From week 131 onwards, whether it's 6 or 10 Paladins, they won't be able to do anything against 4 Dragons.
On the "Good vs. Evil" map, I can't say for sure what the optimal build is for the Knight on the first week, but the Warlock definitely needs to build a Dragon Tower on the second week... overall, I think the Warlock is clearly overpowered on this map.