  For a long time there have been active discussions about the sizable
differences between $|V_{ub}|_{\rm incl}$ \& $|V_{ub}|_{\rm excl}$. However,
the real $|V_{ub}|_{\rm incl}$ might be smaller than usually stated. The
connection of the worlds of hadrons and quarks (\& gluons) is subtle: we cannot
ignore final states with a pair of $\bar KK$ mesons plus pions: $\left[ R (B
\to l \nu \; \pi ' s) + R (B \to l \nu \; (K\bar K +\pi 's )) \right]$ $\simeq$
$R ([b\bar q] \to l \nu \, u (\bar q_i q_i + \bar q_jq_j\bar q_k q_k...) \bar q
)$ with $\bar q=\bar u, \bar d$ \& $q_i = u,d,s$. It might show the limits or
violations of duality close to thresholds. While inclusive FS cannot be
measured, exclusive ones can be done soon by LHCb and later also by Belle II
about $B^+ \to l^+ \nu K^+K^-$ \& $B^0 \to l^+ \nu K^+K^-\pi^+$. Present data
have not given us the information about resonances in the region of 1 - 2 GeV
that we need to understand the underlying dynamics in $\Delta S=0$. Future data
for exclusive $B \to l \nu \pi \pi$ might also narrow the gap between
$|V_{ub}|_{\rm incl}$ \& $|V_{ub}|_{\rm excl}$ in the opposite direction. I
comment about $B_s^0 \to l^+ \nu X_u^{(s)}(\Delta S = -1)$.
