This doesn't really add much, but it's interesting nonetheless.
In a single player game, I took a screenshot during the draft of a left tackle who was shown as developed only 1% (adjusted rating of 4.9, 11th among offensive tackles). I was curious to see what the bars would end up looking like for a 1% developed player.
Here is the screenshot taken of him while still on the draft board:
As you would expect, his position experience level at LT and all other line positions is 1 (using a 1-10 scale).
Now here is a screenshot of him after camp but before any preseason games have been played (drafted by an AI team):
setting aside the anomaly of a 13/53 player being considered 1% developed, what I found interesting was after camp his position experience stayed the same at his primary position but increased at two other positions.
No position change, no playing time, only a standard training camp, yet he develops at two positions other than his own.
Not sure what conclusions, if any, can be drawn from this.
There was another interesting occurrence during the same solo game. Unfortunately I didn't take an early screenshot of him, but I had a second-year flanker whose position experience was (to the best of my recollection) FL=4 and SE=3 (could have been 4). I sent him to the summer league and this is how he came back. You can see the reason I moved him from flanker to split end:
A flanker goes to the summer league and picks up a bunch of experience at split end. Not really what I had expected.
Again, no answers here, just a couple of things regarding position development that made me scratch my head.