User blog comment:RaijinSenshi19/Buddyfight Daily Decklist Development - The Multi-Purpose Dragon/@comment-3974145-20160611014928/@comment-6102960-20160613151251

Well, yeah, Anzestor works better in some cases, because without soul, Drum Bunker becames painfully vanilla, but overall, the uses of JDB is better.

It is just that you wont always see Charge, so adding Dragoknuckle helps when you are looking to get multiple Jacks out over multiple turns.

And yeah, I get your reasoning for Burn Energy, it is just the issue of space and consistency that is a problem here. Jack is one of the decks that wants to stay at the minimum number to increase the odds of getting that base Jack even more. If running it is such a concern, then Beistand can be switched out for it.