Although I am a poet, I would believe that the least important would be pattern. The economy of words help portray a message with a deeper meaning. The main idea of a poem gives a reader a knowledge of what the poem means to the author. A stanza is a lone used to write the poem, so it is very important. Pattern in poetry isnt always a thing, such as free verse poetry, where it might not rhyme or make much sense if you look at it the wrong way.