Bale will 100% start when fit. Frankly Isco's best chance to start regularly is if Modric's age starts to catch up on him, which could be a long time since Modric is still fucking good now. No way Isco would start ahead of Kroos or Casemiro in midfield. Same with starting ahead of Tranny and Bale, never gonna happen. His best chance to start regularly is with other clubs.