Well of course they are, he's banging the goals in and no one else looks like they can.
If Locadia or Andone want more time then they will have to earn it and earn it on impressing in 10, 15 or 20min substitute spells. If they can do that, then when Murray needs a break, which will come with the midweek games and as we head into the FA Cup, then they can earn their starts.
Honestly though, leaving out your best in form striker for 5 games just to try to 'evolve' the team; play your best team whenever you can regardless of how old they are or how much longer they might be with you.
I am a big Murray fan, but I also feel we need to change something away from home if we want a chance of better results. Murray is clearly our best in form striker, but away from home we create little and score little. I think Andone showed enough at Cardiff to warrant some starts away from home - and he gives us something different. OK, so say he's given 3 starts away, to fully get the pace of the league and see what he can do. It's not exactly a big risk at the moment [IMO] is it, I mean, we lost at Cardiff?! At home I would continue to start Murray.