I'm not sure myself. I don't see it as necessary, though. Bank money is what we use the most. MB is outside money.
From your viewpoint, based upon your understanding of how banks create money, then yes.
But my understanding of how banks create money requires that some MB exist, else the bank couldn't create any money.
I think this is probably the most important policy implication between our two different understandings of how banks create money.
If we had a banking system with no money at all (like a new country that has established a currency but hasn't issued any of that currency) then:
1) Under your understanding, banks would just mark up the account of a borrower in exchange for a note. And thus there would be no issue.
2) Under my understanding, the bank wouldn't be able to make any loans, because the bank would have no way to acquire the money overnight, not even if the depositor deposited the loan funds back into a bank account instantly (because the bank still wouldn't have enough to cover the loan and the reserve requirement for the deposit)
So even though we agree that banks can create money, and our only real disagreement is the exact procedure that banks go through to create new money, there can be huge differences in the economic implications.