Well it allows the Bell entry to be a little more competitive with the Vettes and retains the ability to make sure that the 'works' team does not take advantage.
Also as to the GT-2 weight reduction, I think the Porsche is already running 25kg light (don't know from where, but it is in my head) hence the verbage;
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The Porsche 911 RSR GT3 may continue at its currently homologated weight
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