Google Checkout Terms of Service requires merchants NOT require customers to create a shop account or login to a shop during order checkout. Just like PayPal Express Checkout.
But with the Zen Cart check out process, a customer cannot proceed past the shopping cart page, nor advance to either the shipping method or the payment method pages, without being logged in.
Hence the GC button on the login and shopping cart page is required.
This "issue" has been repeated ad nauseam and responded to in both this thread and on the mod support group forum. Possibly why you received no response.

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