I think it's a valid insight, but it's just his opinion, and he recognizes that.
Actually it is a clearly FALSE teaching to anyone that reads the scriptures. Read the account for yourself and then compare it to the scripture he uses and his teaching on it .
"... There are four cups that represent the structure of the Passover. The first cup is the blessing of the festival day, it's the kiddush cup. The second cup of wine occurs really at the beginning of the Passover liturgy itself, and that involves the singing of psalm 113. And then there's the third cup, the cup of blessing which from your Link
involves the actual meal, the unleavened bread and so on. And then, before the fourth cup, you sing the great hil-el psalms: 114, 115, 116, 117 and 118. And having sung those psalms you proceed to the fourth cup which for all practical purposes is the climax of the Passover. Now what's the problem? The problem is that gospel account says something like this: after the third cup is drunk Jesus says, "I shall not drink again of the fruit of the vine until I am entering into the kingdom of God."
http://webpages.marshall.edu/~trimbol3/4thcup4.htm
The problem is that Scott is bending the word of God to fit his new Theology Scott is bends the word of God to fit his new Theology . From Youngs LITERAL translation
Luke 22 18 for I say to you that I may not drink of the produce of the vine till the reign of God may come.'
From the AmericanStandard
Luke 22 18 for I say unto you, I shall not drink from henceforth of the fruit of the vine, until the kingdom of God shall come.
To change the text as Scott says is dishonest and he does it to fit his new theology
"They put a sponge full of the sour wine on hyssop and held it to his mouth. When Jesus had received the sour wine he said the words that are spoken of in the fourth cup consummation, "It is finished." What is the it referring to? That grammatical question began really bothering me at some point. "
That vinegar was not the "fourth cup "and in his heart Scott knows this. ..or he is very deceived..That cup will be drunk at the marriage supper of the Lamb...
Mat 22:2 The kingdom of heaven is like unto a certain king, which made a marriage for his son,
Rev 19:9And he saith unto me, Write, Blessed [are] they which are called unto the marriage supper of the Lamb. And he saith unto me, These are the true sayings of God.
And shame on Scott "it is finished "was the atonement ...The sacrifice was complete...there was no more that needed to be done...it was finished..