I don't think you can read anything into that but coincidence. Pete knows how to address needs based on his depth chart and it is likely those were his needs at the time. It is also likely that those particular years all those studs he recruited just happened to play one side of the ball.
Oh and don't forget there was a lot of negative recruiting that came out against Pete last year. This year it is rumored he is keeping quite a few silent commits so there is no way to tell how it is going to shake out.