Multi-club models and and owners with their fingers in a number of footballing pies are all the rage these days. And, as such, the dispute over one member of the current Rangers squad feels like a very modern day sort of problem. One of the first signings of the Philippe Clement era at Ibrox might just be glad to embark upon something of a simpler life. That is, if you can ever call representing one of the most passionate and expectant fanbases in British football ‘simple’. Oscar Cortes, so impressive until an untimely injury wrecked his initial loan spell at Rangers in the second half of last…