I have a new coworker since last week. We are the only ones in the department. the first day, he bombarded me with questions and suggestions for improvement without any institutional knowledge why things are the way they are, rather than trying to focus on learning the core issues. I gave him short explanations as sometimes there are such long historical reasons and it can’t all be explained in a short phone call. Anyway, this strange man hasn’t responded to a single email from me since he started - I sent 4: informing him of crucial appointments (weekly calls with HQ etc.). What can I expect from this person? Will he be difficult to work with?