I'm not sure I understand your question. The small creditor exemption is based on 3 factors - less than 500 originated covered loans (defined in 1026.43) in the previous calendar year, more than 50% of covered loans are originated in rural or underserved markets and assets less than $2B. You have to meet all 3 to be a small creditor.
I'm not a small creditor and I'm not familiar with the "forward commitment" you are referring to. As I understand the exemptions if you originate a covered loan and sell it the following day then it is 1 origination that counts toward the 500 originations for your institution.
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The opinions expressed are mine and they are not to be taken as legal advice.