  The structure of light diquarks plays a crucial role in the formation of
exotic hadrons beyond the conventional quark model, especially in their line
shapes of bottomed hadron decays. We study the two-body hadronic weak decays of
bottomed baryons and bottomed mesons to probe the light diquark structure and
pin down the quark-quark correlations in the diquark picture. We find that the
light diquark does not favor a compact structure. For instance, the isoscalar
diquark $[ud]$ in $\Lambda_{b}^{0}$ can be easily split and rearranged to form
$\Sigma_{c}^{(*)}\bar{D}^{(*)}$ via the color-suppressed transition. This
provides a hint that the hidden charm pentaquark states produced in
$\Lambda^0_b$ decays could be the $\Sigma_{c}^{(*)}\bar{D}^{(*)}$ hadronic
molecular candidates. This quantitative study resolves the apparent conflicts
between the production mechanism and molecular nature of these $P_c$ states
observed in experiment.
