Obviously his chapter as GM isn't over, but is he already the best GM in Orioles history? Yes, hyperbole, recency bias, etc.
There's a lot of great GMs in the history of the team; Harry Dalton, Lee MacPhail, Frank Cashen, Henry Peters, Pat Gillick and Dan Duquette. I am sure I am probably missing a name or two.
But when you consider that a lot of those names weren't competing in an era where free agency wasn't a thing or when free agency was in it's infancy, I think Elias is in a class of his own. Gillick and Duquette were "win now" types that didn't put too much of an emphasis on the minor league system, even though DD's fingerprints are on the team that won the division last night. But I always think of DD as a guy who was fixing an airplane while it was flying.
Taking into consideration the amount that other teams in the division spend and that the system was in the lower third of practically every ranking when he took over, it's hard not to look at Elias as the best GM in the history of the franchise. Going from 52 wins two years ago to 100 wins and a division title in two years is something no one has done in baseball history, IIRC. It's been a complete overhaul and it's a new "Oriole Way."
Like I said, his chapter isn't over yet but given his circumstances (read: dealing with John Angelos) I do believe he's the best we've had.