Alhamdulillah and may Allah SWT. bestow much good upon the one who translated it and support her with His Might inshaAllah, and you are right it means "and was not less than one of the best companions of Moses (pbuh)." *corrected at its place*
May Allah SWT. reward you with much my sister and all working Ansars inshaAllah.
And i agree that this book is important and perhaps you can check the rest of the translation and correct possible errors and publish it here http://thearrived.hashemstudios.com/?page_id=2300 , as this should be the most important place of reference for non Arabic, English speaking Ansar InshaAllah.
As far as i know there are parts of Volume 2 translated here and there but not the whole book.
Fi Aman Allah