I like my idea better tbh were all 3 are around the same cooldown and serve a different purpose without having the need of an orb cost, I honestly don't see the need it sounds more like a not needed clunky thing. Also having the same cooldown feels more like you don't miss out on a high uptime or usefullnes in a fight. For example now, Divine star has 2 benefits which is low cooldown and able to pop people out of stealth for example, where halo and cascade serve no purpose on damage. They break cc on the weird range and mechanic.
1 thing I do like is cascade bouncing back and forth, what does it do on 1 target, same as now?