Easterling是当代学者，她的观点也许能代表目前的通说吧：...tragedy developed out of performances by a chorus, in which one performer(the poet himself ) was set apart from the rest of the group and took on a series of different roles. Aeschylus introduced a second performer to share the acting... 看来她并没有觉得亚里士多德的说法有问题。他这里说到的这种“演出”（performance）应该就是指Thespis首创的那种，维基百科Thespis的词条说
In other sources, he is said to have introduced the first principal actor in addition to the chorus.……Thespis supposedly introduced a new style in which one singer or actor performed the words of individual characters in the stories, distinguishing between the characters with the aid of different masks.