New Critism, Sarah

"The 'Deathless Song' of longing: A New Critical Reading of The Great Gatsby", the aspect that caught my attention was when Tyson analysed the green light at the end of Daisy's dock. Although I agree that it is a symbol of unfulfilled longing, I do not agree with Tyson's analysis of the light and its symbolism. Green throughout the novel is consistently associated with money. I believe that rather than Daisy being Gatsby;s unfulfilled longing, i is what Daisy represents, which is of course old money, that Gatsby truly longs for. The green light at the end of the dock represents old money which Gatsby could only obtain by marrying Daisy; his unfulfilled longing. By the end "[Daisy] came to the window and stood there for a minute and then turned out the light." This shows that Gatsby will never be old money, and will therefore continue longing for Daisy or old money. My question is this theory does not fit into Tyson's other observations, so how does this interpretation fit into her analysis of The Great Gatsby?