I am going to disagree with your statement - I do not believe we have any WR that scare DB's. We IMHO do not have that speedly WR that can challenge DB's. I do not believe we have replaced who we lost from last year in terms of a WR that can scare folks.
When a DB has to decide which of one or two moves a WR makes, he is put behind. No matter how fast a DB is, he is not catching up in most cases, and if not giving up a reception, takes a DPI...
I think all our WR (including Shoen) seem to have a good ability to double move. We seem to have good route runners. The more time Collaros has with them, and the more time the Oline give Collaros, the better the whole becomes. And, if we can get some running game going... well...