As you know, with the recent update, you can have multiple of the same fighter (element, colour,etc...). As a result, it has become possible to obtain duplicate gold fighters. My question is would it be worth the effort to level up the duplicate fighter to gain more skill points or would it be more worthwhile to sacrifice said duplicate for a massive exp bonus? I realize that some players may wish to have 3 of each kind of fighter to maximize team-building options, so this question would probably apply to those people once they get a 4th duplicate.