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i.e., the Havoc's ranged attack is stronger than other ranged attacks of most other archer specialists because they receive attack/defense bonuses for every second level of the Havoc, while others have lower bonuses, i.e., Dugal has bonuses for every third level, Jezebel for every fifth level, etc.; Vaishana can even be disregarded due to the penalty for ranged attacks and a bonus of 7.
You're confusing it with the 3 heroes. In Heroes 5, all specialists give a bonus to attack and defense according to the formula 1+hero level/2.