I know, it sounds crazy. We droid players love our HK lead and can't imagine anyone else leading our IGs into battle. It's served me well too.
But consider this: Nebit's core lead gives 30% crit chance for both droids and jawas, while Hk's core lead is 30% crit chance for just droids. If you're running 4 droids, no question it's better to go with HK because his other lead ability, 50% TM on a crit, is vastly superior to Nebit's crit chance down for the opponent. But with 3 droids it's a close call...
Take for example a team that might become very popular soon: HK, 86, 88, JE, Nebit. And I think we can all agree that a successful droid squad (in arena) is all about demolishing the opponent on the opening barrage.
Hk's lead only applies to 3 out of 5 toons. Nebit's lead applies to all five...and crit chance down for 3 turns on a crit means when 88 does his opening AoE, you're basically guaranteed to give the entire other team crit chance down for three turns. That's huge. Seems to me that might be more valuable that 88 and HK going again with their basic...and 86 isn't going twice on the opening barrage anyway even with HK lead.
So which would you rather on the opening barrage, an extra HK basic and a 88 basic or crit down for the entire other team for 3 turns (and Nebit and JE get an extra 30% crit chance for the entire battle).
I might still go with HK lead but it's not an easy decision...
Are hybrid Jawa-droid teams the end of mandatory HK lead for droids???