That pretty much sums it up.
Your withdrawals will be apportioned to the deposit method as Dougal points out with card a, b, c. This is good in principle for security reasons.
The downside is that if you’ve cancelled a bank account in which a deposit was made, the funds would be transferred to this and lost.
In order to negate this the only real way I established was to contact 212 in chat and clarify the accounts and have any account no longer in use removed. To do this you’ll need a letter from your bank.
Additionally, if you deposited from Apple Pay on the now cancelled account, you’ll also need the Apple Pay “account” removed.
It has its pros and cons but they really should put a warning on the procedure as you’re about to withdraw, opposed to buried in the terms and conditions.
If I didn’t check I’d be a considerable amount of money down.