I think your stretching a little here. Those names you named would have been moved by most coaches.
Henderson was given a shot at WR and has a better chance to play at DB.
Blechen was recruited for defense. Blechen is that 2 star QB with 4 star safety potential.
I'm not going to discuss the two way players. If their highest ceiling was on defense then good for Whitt putting them there.
Allen has been given a shot at receiver. Isn't good enough. Might get more playing time at DB.
Neilson is too big for OL. Not good enough to play on offense. So, he gets a shot at defense.
Reese - given a shot at offense. Not good enough.
Sanders-Williams - not good enough. Will see the field quicker at LB this year (wouldn't shock me if he moves back to RB next year)
Gonzalous - athlete.
I don't think your list proves anything. A lot of those kids were on offense, weren't good enough, so they moved to where they could play quicker, which goes against your theory that Whitt recruits for defense only. Our offense is much, much, much deeper than our defense this year.