You put it better than I did in my first reply! I was just trying to summarize my thinking on what might've happened. Based on what their personalities are so far, what you're saying does make sense. If Marruk and Rhoun had a relationship together, it would most likely have ended similarly to that.
Do you have a favorite character? In furry VNs, I always go for the one who seems abrasive and cold (Marruk here). Usually, the anger and tough persona came to be because of intensive stress or having had to put up with a lot in life. Eventually, they open up to the MC and become friends or even more. The romance aspect is nice to see because there isn't as much representation in mainstream media that resonates with me on the same level as these visual novels. I'm going with Marruk for my first play through; seeing as he's the type I usually pick, he's hot, and he seems to understand Tucker.