(a) [Subordination of security interest in transferred collateral.]
Except as otherwise provided in subsection (b), a security interest created by a debtor is subordinate to a security interest in the same collateral created by another person if:
(1) the debtor acquired the collateral subject to the security interest created by the other person;
(2) the security interest created by the other person was perfected when the debtor acquired the collateral; and
(3) there is no period thereafter when the security interest is unperfected.
(b) [Limitation of subsection (a) subordination.]
Subsection (a) subordinates a security interest only if the security interest:
(1) otherwise would have priority solely under Section 9-322(a) or 9-324; or