Oujay was pretty good for me. So the question is who SHOULDN'T get the hero crest in the 5. Most people would probably want Gonzales. But people also want a hero and a swordmaster so it's pretty much a Fir vs Rutgar and Oujay vs Dieck all over again.
I bought promotion items since I don't care about ranks but if I had to choose I would pick Fir and Dieck.