Dear Ujm,
The USA did not have any Conservative Jews back then. Only Orthodox and Reform. (Or not affiliated = irreligious.) [Or living on their own = slow assimilation.] JTS and OU were both started as Orthodox. There wasn’t a way to make Orthodox Rabbis until a few decades later. It was like trial and error. They didn’t want to make the future Conservative Movement. (The founders in Europe didn’t want to make the eventual Conservative Movement either.)