At this point, Case, like any other school, wants to make sure that if you were to be offered admission you would 100% attend. So they are at the point they have to decide who to make WL offers to once they find out by May 1 how many students will be attending.
If you look at the Waitlist FAQs (CWRU Waitlist FAQs) you will see that 22% of the students on the WL were admitted last year.
The admissions counselors are busy this time of year so I wouldn’t worry too much about them not responding. Just make sure they know that you would definitely attend (if that is the case). I would also add in the LOCI some info about how you may relate to their mission and traditions etc.