Teams rarely trade first round rookies unless they really aren't giving them any playing time or they don't see any potential in their players. Webster and Jack are not the case
Webster might not be getting any playing time right now, but he's one of the future players that the Blazers are hoping to make their franchise player. trading for Jarrett Jack is a more realistic option, since Portland already has a ton of guards and Jack's potential isn't really that great.
webster owns in the game (even though he isnt on my team), hes averaging 23.5 ppg , hes one of the top people running for rookie of the year in my dynasty.