It's more than that; the mass and properties of a pentaquark will tell us a lot about the underlying properties of the strong force. People have been trying to

It's more than that; the mass and properties of a pentaquark will tell us a lot about the underlying properties of the strong force. People have been trying to predict the pentaquark masses and lifetimes for many years. Computations of low-energy strong-force interactions are significantly more difficult than electromagnetism. As far as I know, the proton binding energy has not yet been calculated with confidence, though it should happen in the next decade or two. If the result holds up, this will count as one of LHC's major discoveries.