Triple-A Norfolk’s roster has lost a couple of the Orioles’ top prospects in recent weeks. The Tides are about to gain two more. Infielders Gunnar Henderson and Jordan Westburg have been promoted from Double-A Bowie and will join Norfolk starting with its upcoming road series against Nashville. The pair of high draft picks — both were the Orioles’ second selection in their respective draft classes — has largely climbed up Baltimore’s system together.