This guy might be working for Jed for quite some time now but he never was a 49ers guy or somebody whose name has been floating around for years. Some GMs with other teams were unknown before they got their job and their team started winning.
Trent started from the bottom of the profession and obviously he's got talent and good management/leadership skills to reach this far, albeit the 49ers. After I've seen him talk a few times during the draft and that he puts out very good presentations tells me he is a very good professional and knows what he's talking about.
Also, when he was on KNBR (or another radio station - can't remember when) he appeared to be a personable and likeable guy. I have seen GMs that are just total AsHls and can't even do a decent job. If I am working for a big company and doing my best, with all the talent that I have, dedication, and loyalty to elevate myself to the next position and just get bypassed by an outsider - I would be so raging MAD.