OK, this one has been confusing me for a while - What precisely do the regular cumulative power-ups do in Invasion? Some of my characters seem to get far more out of them than others, and when I power up everyone in a team evenly the power list for my characters seems to rearrange itself a little.
For instance, Scrooge is my second strongest hero overall. He is level 175, Red 9, five stars, and has a total power level of around 200,000
Hiro is my seventh most powerful hero, at level 146, Red 0, five stars, power level 150,000.
Over the course of this latest Red Invasion, they have been given equal power-ups. Hiro has ended up above Scrooge on my hero list sorted by power. Can anyone explain?