So that is why Mark answered that he passes the cup because his destination is earth..because only the 144000 will be in heaven..
This is really sad. Earlier in that chapter you referenced in luke, It is very specific that Jesus was sharing a passover sader (meal) with the deciples. There are four cups of wine consumed during a sader. the first is the cup of blessing (Sanctification) at the very begining of the meal. The second is the cup of plagues. consumed before the meal during the time of the retelling of the story of the exodus.Then the meal is eaten. AFTER the meal the third cup is consumed. It is THE CUP OF REDEMPTION. The last cup, the cup of Praise, is the last of the four. The deep significance of each of these ( and everything else regarding passover) can be found at most Messanic Jewish sites. I don't know if links are allowed here but it is the third cup that "AFTER THE MEAL" Jesus took and said...
Luke 22:19 And he took the bread, gave thanks and broke it, and gave it to them saying, "This is my body given for you; do this in remembrance of me" 20 In the same way, AFTER THE SUPER, he took the cup, saying "This cup is the new covenant in my blood, which is poured out for you."
The significance of THAT peice of bread in the passover sader(The Afikoman) could start a discussion of the triune nature of God.. ...
back to the cup..
That cup is "THE CUP OF REDEMPTION" The covenant in Jesus' blood is not for only the 144000. his blood was shed to REDEEM us. All of us who call on his name.
By the logic you gave, as the belief of the JWS, then the cup is only for the 144000 then the millions of witnesses dishonor the blood of their redemption by "passing it"..
How do I get through to my friend?