Just a note here that while I agree with you about short stuff being open and Josh deciding to take shots.....
....to be fair, we don't know how the play was designed to be read. I have been told a lot of Daboll's plays (and maybe Dorseys) were designed to be read deep to short.
That said, there have been games where Josh did a masterful job of taking the short stuff and carving up the D. Wins at LA and at KC would be two examples. So I don't know why he got away from it.
Not on training camp per se, but Astro put out a nice piece about what he saw initially from all the WR
https://buffalofambase.com/2023/07/27/early-look-at-bills-depth-chart-offensive-playmakers/