I see your points
@Annahnomoss
In my opinion though, that's more down to expecation rather than looking at specific reasons on what has actually happened. Shaw has had those games but Rafael had to break into the European champions, Shaw didn't. Rafael had to move to the other side of the world, Shaw didn't. I can go on all day about that, size of club, language barrier, level of competition etc.
In no way am I saying any of this to suggest Rafael is or will be better than Shaw or anything, Shaw looks a great talent. When Rafael had a pretty much injury free season (in a team doing well, not 7th), he was the best RB in the league. He wasn't able to go on with it, who knows what that was down to, his hamstrong injury in the Community Shield, Moyes, his own complacency, who knows but he is still growing as a footballer and has shown great improvement in all aspects of his game.
Going out and improving on Rafael is going to cost big money, it woudl seem such a huge waste when we have a very good, potentially even great RB already who loves the club and shows the passion needed to get ourselves out of this mess.
We doo need cover for him but I would stick with Rafael as number one every day of the week.