The comments on this post that are suggesting Rosario did not win this position on his own merit are deplorable. As someone who knows him both personally and professionally, I can say with 100% certainty that he definitely deserves this job. He is a fantastic musician and human being, well-liked by his colleagues and peers, and easy to sit next to.
Please don't jump to conclusions about a situation you know nothing about. Instead, consider being supportive of someone who has diligently worked to navigate the messy waters of orchestral clarinet playing and auditioning. Bravo to Rosario!