Well that's nonsense...
Back in 1996 'Magic' was recording one of the highest ever averages in the history of the third tier AND, as you say, doubling into the top division with the London Lions. A few years later he was the Conference League Riders Champion.
No, of course at 40 he's not better now than he was then but David has most certainly been at the very top in this league before and for some years at that (hence a record number of maximums at this level - a more salient fact really than record points scorer) so to say he's never "been anything" is frankly ridiculous..
And as Teaboy points out, his average and more importantly consistency marks him out as still a valuable second string in anyone's book.