This is 3 days late, but re: Vince Gerasole leaving, here's the tribute post from CBS 2: https://chicago.cbslocal.com/2020/08/14/vince-gerasole-signs-off-today-at-cbs-2-here-are-some-of-his-favorite-stories/
Vince also really looked up to Pam Zekman (from being her intern, then being awestruck at actually being able to become her colleague, then setting up an online virtual tribute for her after her unceremonious lay-off) and it almost seems fitting to ride off into the sunset in the same (sort of) time frame.
With Erin gone, it's ultimately a smaller morning team, since the breaking news and traffic roles have been combined -- which is a win for the bean counters of course. I also don't think execs want to do away with a traffic anchor in Chi, so ultimately, Yasmeen makes for the best overall morning pseudo-anchor / fill-in anchor they have at the moment without also commanding a large budget (just my speculation), since she's relatively new and still doing traffic like she was at KOVR. For Mugo, I personally think she has potential to move into an anchor chair sometime in the future (maybe weekend mornings if/when Suzanne retires/leaves?) / set for bigger things.
Speaking of "nonstop news," as you referenced, here's a throwback [https://www.newscaststudio.com/2019/03/08/cbs-2-chicago-nonstop-news/] about that segment that really highlights how much turnover there's been at CBS 2 in just ~1.5 years.