  Using the QCD {\it hybrid} (moments-Laplace) sum rule, we show
$semi$-$analytically$ that, in the limit $M_b \rar \infty$, the $q^2$ and $M_b$
behaviours of the heavy-to-light exclusive ($\bar B\rar \rho~(\pi)$
semileptonic as well as the $ B\rar \rho\gamma$ rare) decay--form factors are
$universally$ dominated by the contribution of the soft light-quark condensate
rather than that of the hard perturbative diagram. The QCD-analytic $q^2$
behaviour of the form factors is a polynomial in $q^2/M^2_b$, which mimics
quite well the usual pole parametrization, except in the case of the $A_1^B$
form factor, where there is a significant deviation from this polar form. The
$M_b$-dependence of the form factors expected from HQET and lattice results is
recovered. We extract with a good accuracy the ratios: $V^B(0)/A^B_1(0) \simeq
A^B_2(0)/A^B_1(0) \simeq 1.11\pm 0.01$, and $A^B_1(0)/F^B_1(0) \simeq 1.18 \pm
0.06$; combined with the ``world average" value of $f^B_+(0)$ or/and
$F^B_1(0)$, these ratios lead to the decay rates: $\Gamma_{\bar B\rar \pi e\bar
\nu} \simeq (4.3 \pm 0.7)
