I'm only quoting part of my email in order to keep certain things confidential:
Granted, Jehovah's Witnesses believe they (we) are God's organization and sole channel for [biblical] truth on the earth. However, the brothers recognize that the Catholic Church (for example) is responsible for preserving quite a bit of scripture that has come down to us. What about all of the biblical scholarship that takes place in Christendom? Do we not use and benefit from those things? The churches sometimes also have good observations on how to understand a text or [scriptural] matter. Even Brother Russell acknowledged that Lutherans, Baptists (etc.) know some truth: they are not completely devoid of truth. Please also see the 6/15/1992 WT about the figurative dragnet.
[The Proclaimers book also discusses how C.T. Russell took fragments of the truth from respective groups, then later modified or adjusted those verities.]