3 of the 4 players you noted are NOT QB's which was the point of my comments based on a segment from the article itself  i.e. Helfrich not having returning QB's for 2015 and 2016 vs recruiting in general. 

Also, as WALLe correctly noted, Herbert was an "okay" recruit coming out of high school and especially after he broke his leg. Here were his offers at the time from one article I read: "Herbert chose Oregon over offers from Montana State, Nevada, Northern Arizona and Portland State." Yes good enough to get offers but hardly considered an "elite" talent. 

So I guess you could argue Helfrich saw a talent nobody else did or he just got lucky. Regardless the fact Helfrich had to go the graduate transfer route in successive seasons for what was a highly rated program when he took over says a lot about his recruiting / head coaching skills or lack thereof. GO DUCKS!