  It is shown that the number of independent weak form factors collapses if the
heavy diquark exists inside the baryons containing a single heavy quark. The
relations between the weak form factors are quite different in the case of
light diquark. So a careful analysis on the future data of the weak form
factors would clarify that in those baryons the correlation between the heavy
quark and a light quark is stronger or weaker than the one between two light
quarks.
