[求助]請問一道文法題

Poet Amy Lowell began her career by publishing the conventional volume A Dome of Many-Coloured Glass, despite eventually succeeded Ezra Pound as leader of the progressive Imagists.

雖然答案是將despite->although she, 但我想請問as 為何不可改為as a 呢?

Leader不加冠詞可以嗎?

可以

这种的都可以,president,leader....

对，记得有说职务前不用冠词，是这样么，版主？

tks!!!!!