  In the interlayer pair tunneling (ILPT) theory of superconductivity the large
scale $T_c$ has its origin in the k-space locality of the inter layer pair
tunneling matrix elements. We reinterpret the same physics as a process of
resonant pair tunneling and illustrate it through cooper pair analysis. This
interpretation is used to give a mechanism which leads to a singular
suppression of $T_c$ as function of c-axis(off plane/axis) disorder. In this
mechanism the non resonant tunneling processes arising from the c-axis disorder
in general contributes a pair binding energy which is reduced by a factor
$\frac{T_J}{\epsilon_F}$, where $T_J$ is the interlayer pair tunneling matrix
element and $\epsilon_F$ is the fermi energy. This leads to a simple theorem
which states that the scale of $T_c$ is controlled by the space average value
of the bare one electron interlayer hoping matrix element. After briefly
discussing that the ET and TMTSF molecule based organic superconductors are
strongly correlated narrow band systems, the dramatic reduction of $T_c$ by
anion disorder in organic superconductors is explained by our mechanism. Off
plane disorder effects in some of the cuprates are also discussed
