I continue to believe they are using 5* health and match dmg as a balancing tool.
Havok has high match dmg, but a bit lower than recent ones. His health is still pretty high! I mean yes it’s not 16K but he’s not slow (well, not on red and blue anyway) and has 3 active direct dmg abilities. The slower-to-get going characters, or ones doing less direct dmg, get more health so they can stick around longer and be more effective. They also get more match dmg for the same reason. Havok gets a bit less health and match dmg because he’s got some pretty cheap nukes he can hit you with.