Kammala jumla mai zuwa: Yawancin waɗannan tambayoyin an sake nazarin su a 1986 bayan binciken bincike na irin wannan mummunan lalacewar Teton Dam na Ofishin Reclamation a watan Yunin 1976, da kuma kusan lalacewar Lower Van Norman Dam na Ma'aikatar Ruwa da Wutar Lantarki a cikin
Girgizar kasa ta San Fernando a shekara ta 1971. Farfesa Ronald Scott na Caltech, wanda ya halarci binciken Casagrande, ya lura a taron 1987 na ci gaba a kan Baldwin Hills cewa Casagrande ya yi watsi da ko bai san motsin ƙasa ba a fili ba dangane da tafkin (misali waɗanda ke Stocker-LaBrea) a cikin bincikensa. Wani injiniya, Stanley Wilson - wanda kuma ya yi aiki tare da Casagrande a kan binciken 1972 kuma ya goyi bayan da'awar cewa rushewar man fetur ya kasance wani abu mai mahimmanci - yanzu ya yarda cewa irin wannan ƙaddamarwa na ƙasa ya shimfiɗa sosai a waje da yankin tafkin, musamman a cikin yankin Stocker-LaBrea, don haka ba za a iya danganta tafkin da sauran ƙungiyoyin lalacewa ga tafkin kanta ba - ta haka ne ta hanyar ba da alhakin alhakin gazawar ayyukan man fetur. Saboda haka, ra'ayoyin game da rawar da ake yi a cikin filin mai da kuma sake sakewa ya bayyana ya zama daidai.