DJ's first goal is to simply keep his head above water for an extended period of time at the ML level. And not fall down catching fly balls. And not get hurt a bunch of times.
It's tough to know right now who DJ Stewart really is as a player at this level. We know even less about Mountcastle, but the prospect pedigree is obviously higher.
So evidently there is an expose on the team formerly known as the Redskins coming out tomorrow in the Washington Post that is suppose to be devastating to the team and the league. Several of the teams employees were fired last week.
I think there is much uncertainty in Santander's projections going forward. He had a .565 OPS in his first two shortened seasons in Baltimore, then a .773 last year. One story is that he was yanked out of the minors as a Rule 5er, and that sidetracked his development. Plausible, but doesn't necessarily mean he's sure to be an .800+ OPS guy. We need more data to go on, and unfortunately we won't get a whole lot this year.
He ran out of gas in September and had a .363 OPS from September 8th onward until getting hurt and missing the last week of the season.
His OPS through 77 games was .854, his final 16 games dropped his season OPS to .773.