Yep. Spicer might also be a leaker. In fact I would bet on it. It’s part of his job.
I'm sure he was. Trying to have friends on both sides. I doubt he meant any harm from it, but he should have wised up that his indiscretions were fodder for fake news, and cut it out.
Press Secretaries leak all the time and you're right, it's part of the job but the intent of PS leak should be to advance the President's message while at the same time currying a relationship with certain members of the WH Press. The leaks by Short were meant to damage the administration and prevent a clear and coherent message from ever getting through.