The rate lock itself is a valid COC, but you can't consider differing investor charges unrelated to the interest rate when you re-disclose.
WHy is investor #2 breaking their charges out? Chances are, unless it's something being paid to a 3rd party servicer, even if they have itemized their charges to you, you would still lump them in to total origination charges.
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My opinion only. Not legal advice.
Say you'll haunt me - Stone Sour