Unless there was a Treaty change, the member states. Why have an extra EU FM then?
That sounds like some David Icke type conspiracy theory. More like the EU wet dream of decades.
Vetoes have been reduced in number but those that exist retain their potency by definition: A veto is a veto - very few left now and all those are probably on the endangered list.
On the subject of the number of vetoes. Is it any surprise given the enlargement of the EU? Obtaining unanimity among 16 members was difficult, let alone among 27/28 member states. There is a need for compromise on occasion. How about a bit less speed and far less greed?
Whether the EU should have enlarged so quickly is another matter. See above.
Brexit has been an irritant that the EU did not want and has had to deal with, but it has had little, if any, effect on the governance of the EU. I'm sure.