No way, Rosa is like, the main thing that keeps Cecil being a good man. All that becoming a Paladin stuff wouldn't have happened if he wasn't looking for a way to defeat Golbez and save Rosa.

If Rosa had shown affection to Kain and chased him into the village Mist, Cecil would've been overcome by jealousy and totally joined Golbez's quest for power and darkness. They would've amassed crystals way way faster and probably beaten the crap out of mopface. Eventually they would meet up with Zemus and realize what crapfaces they've been and Kain & co. would come save the day, probably with Cecil in the party somehow.

Also, Kain NEVER would've told Rosa to get off the big whale. Not ever.