The first person who knows his rotation and doesn’t die to the mechanics ( I say this because you imply top 3 damage everytime) will potentially help you progress, hope they learn the mechanic.
The second person needs to learn how to perform their rotation while doing mechanics. You can dance all day but if you dont do enough damage you eventually hit the rage timer anyway.
Neither are good for the raid. Set them out and ask them to do their best to improve or they wont be coming back.