The Conditions of RBV are Seemingly Non-Complementary
The two limiting conditions for RBV to be earning sustainable supra-normal returns are seemingly non-complementary. Having superior resources (Valuable) is definitely very important / necessary. But, to be protective of these resources (making them Rare, Imperfectly Imitable and Non-Substitutable) would pull down the inherent advantage.
Instead of these resources enjoying protection, they should be competitive against the rest to be sustainable.