It's possible to do both, depending on the situation, ROW, etc. Center creates a different set of obstacles, but it's doable. Won't know anything until they get to 30% design.
Though it really doesn't matter at this point. We're getting into the weeds a bit. $40-50million is fine regardless of center/outside for this exercise.
Let's move on to BRT.
The closest thing to what we might see in Denver, that comes to mind, is
Cleveland's Healthline.