Yeah, young players. However, bear in mind: You must give up an asset to gain an asset. Bjorkstrand has upside potential, and he's worth keeping, but the player you're trying to acquire is Kovalchuk, so to gain an amazing asset, you must give the Devils something amazing in return.
You're overvaluing Kovalchuk then. He's 34 years old now, hasn't played in the league in years, the olympics, nor the World Cup, recently, and doesn't even have a contract in the NHL at the moment.