  We propose a conjectural explicit isogeny from the Jacobians of hyperelliptic
Drinfeld modular curves to the Jacobians of hyperelliptic modular curves of
$\mathcal{D}$-elliptic sheaves. The kernel of the isogeny is a subgroup of the
cuspidal divisor group constructed by examining the canonical maps from the
cuspidal divisor group into the component groups.
