Actually, most newer members of the EU don't have the Euro (eg Poland, Romania, Hungary, etc). If Scotland wants to create a currency of their own, they can do

Actually, most newer members of the EU don't have the Euro (eg Poland, Romania, Hungary, etc). If Scotland wants to create a currency of their own, they can do that - even if the wanted to, they couldn't get the Euro right away, it takes some time. On the other hand, one of the main arguments against leaving the UK, at the time of the referendum, was that Scotland couldn't leave the union and keep the GBP as their currency, and they feared a weak and especially a volatile currency could wreck havoc on their economy. Having a secure path to EU membership (without veto power by the UK) and the backing of the ECB would help a lot against that risk.