If they are good centre backs then the wing backs move forward , and become '' pseudo " wingers , providing the width
It helps if they can put good crosses in. O' Donnell has certainly put in a couple
IIRC going back to Craig Brown's era and the 3 - 5 - 2 Tosh McKinlay , or Tom Boyd , were at LWB
They could be relied upon to provide good crosses
e.g. McCoist's goal against Bulgaria
away draw