Suppose you have a MultiSig wallet with 4 seeds. 2 Seeds are required for signing.

Now, consider the following scenarios where a hacker manages to obtain 3 of the 4 seeds:

a)  Can the hacker steal all the coins in the wallet without access to the 4th seed and without any knowledge of which addresses belong to the wallet?

b) If the hacker knows some of the addresses associated with the wallet that hold Bitcoin, would they be able to steal coins from those specific addresses?

My expectation is that the hacker might still be able to steal coins, even without the 4th seed, because having 2 seeds is sufficient to sign transactions. They could, in theory, brute force or search the blockchain to identify wallet-related addresses and initiate transactions.

Am I missing any critical considerations here about the security of multi-signature wallets in this case?