The thing about Hyperion is that he's easy to fight, even stun immune, provided you can consistently bait his specials and/or keep him power locked. He doesn't actually benefit all that much from being the boss UNLESS attackers cannot bait his special attacks. He does much better on various power gain nodes such as Strikeback and Kinetic Reactor so that you not only have to watch his innate power gain, but also the node impact.
I'm unfamiliar with the Champion so cannot comment there but if Hyperion hasn't had any boss kills in 3 wars then you're hardly going to lose out by switching him out.
Comments
I'm unfamiliar with the Champion so cannot comment there but if Hyperion hasn't had any boss kills in 3 wars then you're hardly going to lose out by switching him out.