He plays guitar (which is the staple instrument in rock shows), he sings, and most of all he's just always been quite forefront in all their concerts, especially in more recent years as he hasn't really lost any of that energy. Christine's talents shouldn't be undermined but she's always said she was very happy being off to the side of the stage, being lowkey, playing her keyboard. If they were to just continue without a 'replacement' for him, the show would be HUGELY affected.
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