Credit Scores and Mortgage Rates?

Let's say someone has 803 FICO score, no debts, 90k year salary, investments, and savings. Let's say the person is single with no co-borrower. If lenders listed daily prime rates of between 5.5-6.1%, why would the person only get preapproval 15-year and 30-year mortgage loan offers at 6.1% or higher. ... show more Let's say someone has 803 FICO score, no debts, 90k year salary, investments, and savings. Let's say the person is single with no co-borrower. If lenders listed daily prime rates of between 5.5-6.1%, why would the person only get preapproval 15-year and 30-year mortgage loan offers at 6.1% or higher. Shouldn't excellent credit and good financial standing result in a lower rate?
Update: The person has 0 debt. The actual loan amount requested was $130,000 even (that is not the purchase amount but the amount after down payments and such; he was looking at purchasing a house listed $165,000).
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