- Recently, a more than 2 discrepancy has been observed between the well measured inclusive value of Vub and the predicted value of Vub from the unitarity triangle fit using the world average value of sin 2. We attempt to resolve this tension in the context of grand unified SO(10) and SU(5) models where the neutrino mixing matrix is responsible for flavor changing neutral current at the weak scale and the models with nonproportional A-terms (can be realized simply in the context of intersecting D-brane models) and investigate the interplay between the constraints arising from Bs,d-Bs,d mixings, K, Br(), Br(e) and a fit of this new discrepancy. We also show that the ongoing measurement of the phase of Bs mixing will be able to identify the grand unified model. The measurement of Br(e) will also be able to test these scenarios, especially the models with nonproportional A-terms. 2007 The American Physical Society.