In message , at 09:25:55 on Mon, 18
Jul 2016, Neil Williams remarked:

You can have free movement of researchers between universities, with
contracts in place, without having free movement of unemployed people
looking to be bus drivers, plumbers or whatever. It isn't[1] all or
nothing.

You can't have a scheme like that without being policed by visas, work
permits, or whatever. At which point it's not "free movement" in the
normal EU sense.

--
Roland Perry