Another component of Banxia-Houpu alongside both ginger and magnolia offcinalis is Pinellia Rhizome (root of pinellia ternata ) and while it also appears to have inherent anti-depressant effects it works synergistically with magnolia officinalis in exerting them.  This has been noted elsewhere where the combination of 15mg/kg magnolia neolignans paired with 16-32mg/kg pinellia ternata rhizome was able to preserve noradrenaline concentrations in stressed rats; in this sense, since the neolignans were inactive while pinellia was weakly active the synergism seems to be from the neolignans potentiating the effects of pinellia . 
In the sprint study 62 stands for the correlation coefficient not the change in DHT. In the sprint study it says: ± at baseline, ± pg/μg protein, are you sure that the numbers are baseline and then post training? If that is the case I think they should have expressed it a bit clearer in the study instead of saying baseline, pg/ug protein, at first I interpreted it like it was first serum levels of dht, then tissue levels of dht or something because the units are only mentioned in the post training levels of dht and not in the baseline levels, if I have interpreted it correctly.