I just don't know why they didn't just cast someone that would be convincing as a young Sebastian Shaw in the first place, the same way they cast Ewan as a young Alec Guiness, cause Hayden certainly wasn't cast for his ability to act, as far as kids not recognising Shaw as Anakin at the end, it's easy ....20 years after being pulled out of a lava pit how recognisable would anyone be?