  We present results from conducting a theoretical chemical analysis of a
sample of benchmark companion brown dwarfs whose primary star is of type F, G
or K. We summarize the entire known sample of these types of companion systems,
termed "compositional benchmarks", that are present in the literature or
recently published as key systems of study in order to best understand brown
dwarf chemistry and condensate formation. Via mass balance and stoichiometric
calculations, we predict a median brown dwarf atmospheric oxygen sink of
$17.8^{+1.7}_{-2.3}\%$ by utilizing published stellar abundances in the local
solar neighborhood. Additionally, we predict a silicate condensation sequence
such that atmospheres with bulk Mg/Si $\lesssim$ 0.9 will form enstatite
(MgSiO$_3$) and quartz (SiO$_2$) clouds and atmospheres with bulk Mg/Si
$\gtrsim$ 0.9 will form enstatite and forsterite (Mg$_2$SiO$_4$) clouds.
Implications of these results on C/O ratio trends in substellar mass objects
and utility of these predictions in future modeling work are discussed.
