Hero power calculation – why does a 5* Hero with lower stats than a 4* Hero have a higher Card Power?

I agree.

Click if new player or more details

Food and Hero XP

In my opinion the main reason for 4* 4.70 is 5* 4.80 heroes take 3.84x food and 2.12x Hero XP ( in general when comparing 4* 4.70
versus 5* 4.80 ).

So 4x rainbow 4* 3.60 teams ( and then 2x rainbow 4* 4.70 teams) much more cost effective than 1x rainbow 5* 4.80 team when first starting in Empires.

Missing

In my experience, the main reason for 5* 3.70 is special skill, color stacking, and lack of 4* hero that fits the same role in your roster.

Looking at you yellow 5* 3.70 Vivica / Joon ( yellow 4* heroes are a sorry bunch ).

Notes

Color stacking

Color stacking, Empires hidden buff