If you ask any Wales fan what their recent success has been built on, they will immediately point to their solid backline.Before the start of Euro 2020, Rob Pages' side had kept ten clean sheets during their previous 13 excursions, a run that started at the end of their successful qualifying campaign for this summer's tournament.Building solid foundations that you can develop a side is good and good, but if you do not have a little magic at the top end of the field, you will not get far in international football - or any…