I can understand what you're hoping for with this suggestion, but tbh I'm not the biggest fan of 'veteran' rewards - mostly because of how they've been used in the past to the benefit of black market sellers.
On the subject at-hand, the "First to Cap" reward is a special thing to award Legends that reach it first. It's a race. We've done this kind of 'first to cap' thing for the last couple of expansions and it's been pretty fun :-)
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