I find it odd any prospect made it so far with only one position rating (outfield no less) when the AI is in charge.

It makes me suspect he was force started. Can the OP confirm that the player
was not force started?
The biggest issue I see; and there are several threads on it, is the AI playing players out of position early in their careers in opposition to the defensive spectrum. Typically it takes a good hitting OF and makes them a good hitting poor fielding infielder because it can. It's very bad logic, but it means that single position players are a rarity in any OOTP league.
I do agree with part of the original complaint. Players who start as OF should (and probably do IRL) have reason to have played all three OF positions. Doesn't mean they have good skills at each but it should be normal for some rating to exist at all three OF positions. Better logic would be that an IF transitioning to a utility role (correct by def spectrum) may never see CF or RF and therefor should not have a rating initially.