Can't recall the issue but one of the last few issues of the "old" Wild Steelhead and Salmon mags has a pictiure of Ed Ward, a steelhead and a tube fly that just might be an Intruder. Hang on, let me look it up...
[5 minutes pass as Dana rifles through his magazine pile]
...okay, I have it--page 12 of the Spring 1999 issue (Dec is on the cover preparing to beach a chromer). The tube is pretty big and looks similar to the one pictured in Hogan's Skagit Journal book, but not exactly. No matter--it's a B-I-G fly, certainly an intruder, whether it is THE fly or not!