Speed and decisiveness; two words that would best describe Rangers’ summer window so far. Five new signings, a host of departures, and a squad overhaul many have been crying out for is finally well underway. Out goes Borna Barisic, in comes Jefte Vital. Connor Barron, one of the most exciting young talents in Scotland, arrives from Aberdeen to offset the departures of John Lundstram and Ryan Jack. Clinton Nsiala, the 19-year-old centre-back snapped up from Italian giants AC Milan, could be the key figure in Rangers’ potential post-Conor Goldson succession plan amid interest from Birmingham Cit…