1: weak to strong:
10%*1.0 + 25%*0.6 + 45%*0.2 = 34% (less then just the 45%!)
2: strong to weak:
45%*1.0 + 25%*0.6 + 10%*0.2 = 62%
My Suggestion Option 1: keep the importance of order of heroes (as additional configuration) -> it should be more clear visible and we should be able to change the order easily
Option 2: get rid of the order of heroes -> sort the skills always from strong to slow at calculation overall bonus
Greetings Kuishikama
PS: I apologize for my English. Its not my native language.