You don't see any difference between Martin having nearly 1,400 professional ab's... ending '18 having posted an .807 OPS in 453 ab's in the Texas League... and Grenier who had 162 ab's last year in the South Atlantic?
Their ultimate ceilings might be very similar... but there is a difference in who they currently are.
There's no difference in what they mean to this team.
If you want a defensive SS with a modest bat, either player or Jose Iglesias can get you there.
You don't have any of those guys because you are intrigued by their offensive potential.
You get them because they can pick the ball and help out your pitching staff. Ground balls. Pitch to contact.
There's absolutely no reason to wait for years on Grenier. He was an experienced college SS on Nationally competitive team and he had the questionable bat when you drafted him. So if you take him with your second pick and you don't plan to use him for exactly what he is, then it's a really stupid pick.
If Cadyn Grenier was the Orioles 2019 Opening Day SS, it makes exactly the same difference as playing Richie Martin.
Now, in 2020 and in 2025.
Elias didn't draft Grenier so maybe he has a very different view of him than the previous regime than a guy like Martin and that's fine.
...but Martin isn't a bridge to Grenier. You can use either in any year you want for what they are.
You can keep them as long as you like because it's unlikely they have profiles that make them difficult to keep.
If Martin goes Brandon Crawford on you, that's great, but that should hardly be the expectation.