As long as the cost/benefit works out, this would work. People are going to either consciously or unsciously do some simple math in their head:
If the same reward can be had from all bosses, then people are going to farm only those bosses that can be killed quickest because they will get more loot in same time. It's purely an efficiency thing. This is the only reason I was throwing out unique loot for a special boss, because there's incentive to kill that specific boss to get the loot.
Unless you mean, make those special bosses available on a unique board that can only be accessed by clearing the previous board. This may be an easier way to implement option B above, since they won't have to code in a logical trigger on the board to spawn the boss.
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