Evan Carter played 111 games in AA-AAA before getting called up. Manny 109 games.
But sure, Manny wasn't hitting that well.
Yes, I'll grant you that some guys need much less time in the high minors than others. Your examples didn't quite reach the lack of experience Holliday has had, but you could probably find some exceptions that don't prove the rule.
Team situation is definitely a factor in these decisions as well. I don't think the O's are in a situation where it makes sense to push Holliday to the point of losing the extra year.
Anyway, I'll grant you the possibility that Holliday might be ready for OD, I just don't see why we should assume he will be. Why should we assume that?
Who is assuming he’s ready? Elias seems to think there’s a very good chance that he’s ready. Nothing is written in stone but all of Elias’ words and actions suggest that they are moving ahead as though there is “a strong possibility” that he’s ready. I assume that if Elias doesn’t think he’s ready that he’ll go to Norfolk to start the season.