This is the only place in the text where the past-participial form for the verb draw is drew (rather than the standard drawn). Elsewhere in the text, there are five instances of past-participial drawn. (For the verb withdraw, there are two instances of the standard withdrawn but none of pastparticipial withdrew.)
This nonstandard use of the simple past-tense form drew for the past participle was corrected in the editing for the 1837 edition (although not marked by Joseph Smith in 𝓟). The original text has numerous examples of this kind of dialectal usage. For a complete discussion, see under past participle in volume 3. The critical text will restore the original drew here in Ether 7:9.
Summary: Restore in Ether 7:9 the instance of drew for the past participle of the verb draw since this is how the earliest text reads for this passage.