Let me word it another way. Can a normal Monero seed produce the same address as a multisig wallet? And, if so, would that mean that the private spend key generated by that wallet would be able to spend the outputs of what would otherwise be a wallet requiring >1 signature?
To take it a step further (or possibly restate the same question in a different way), can a multisig wallet produce a single seed that allows the wallet to be created, along with master private keys for that address? Hopefully the way a multisig wallet is constructed, it would preclude the "reverse engineering" of a seed.