Using HCG during a cycle isn't just about telling the HPTA to not shutdown bc it is still shutdown. HCG on it's own will cause suppression or shutdown. Rather it's about maintaining Leydig cell sensitivity in the testes so when SERM treatment is started to help restart LH, the Leydig cells are responsive to the signal. Without HCG they'll be without stimulation leading to increased recovery time in most cases.