I'd say so, Bern. He was rushed into the NHL at age 18 (by Bob Murray, so we know his evaluation of Drysdale was always too rosy). And the only coach he has ever played for is Dallas Eakins, one of the worst structural guys in the league, on some dumpster fire Ducks teams. I do actually somewhat trust Tortorella and Shaw to develop him better than that.
Glass half-full, Drysdale clearly has ability -- although it sounds like his draft year offensive profile isn't totally incongruous with his NHL one -- and it's a fine gamble to believe his developmental track can be righted. (Again, I want to acknowledge Super Advisor, Bob Murray, was responsible for what happened on the Ducks.) But the Flyers didn't just pay for a half-full glass. They paid for it filled to the brim, along with buying the glass and the coaster and the stool they're sitting on.