It's a tight call, a lot more Scots took part in the last independence referendum than the Brexit referendum. A higher number of Scots voted to remain in the UK than EU. Clearly the former was just a larger issue for them.
No! It really didn't, we were the second highest net contributor to the EU budget even with the rebate despite having a lower population and less MEP seats than France. We also had an EU migration rate 4 times larger than France's at the point of the referendum, which has associated costs and social impacts too. Schengen exemption only gave us the right to check individuals, not stop them if they were from the EU. Justice? What? The ECJ still had precedence over all UK courts.
Scotland in the UK
Scotland has 63% of its exports going to RoUK (only 18% to the EU), 90% of the rest passing through it and received £13-15bn/year from us over the last decade. Additionally they get lower borrowing rates whilst on the GBP and we pretend we accumulated the debt they rack up evenly across the country. Nobody in history has ever had such a good deal.
The UK in the EU
Britain had ~40% of its exports going to the EU after allowing for the Rotterdam effect and paid the EU £11bn net each year. Subsidisation of student tuition fees added yet more, both through direct subsidisation and payment into the Erasmus fund, which was supposedly part of the £7bn we got back, except we didn't, it went to EU students in the UK. Cost of Polish and Romanian convicts in UK prisons because the ECHR won't let us sent them home, not even counting the cost of the actual crimes. Yeah, that's right, the Lisbon Treaty saw countries brought into the EU that have ECHR-non-compliant prisons. Other social impacts like illegal wages, slave gangs.
So give me a break even comparing the British position in the EU to Scotland's position in the UK. The only way Scottish independence stacks up is if the EU is going to pay Scotland the same amount that we currently do, which would raise a more than a little anguish among other members.
Says who? That's just an opinion, it's likely that the NZ FTA was mutually beneficial, and nobody had to pay either party any money, nor rape their political system in the process, nor surrender fishing rights, nor have EU customs plonkers stationed between two parts of their country. It was the EU that screwed up the UK-NZ relationship in the first place.