EB Jacks supposedly don't grow as big as natural strain nor do they have as much belligerence and aggression from what I gather. From personal experience though, E. Blue Acaras are a bit territorial, but they end up getting beat-up when you keep them with more aggressive fish, as mine is recovering in a breeder net atm, pending injuries administered likely by my 2 male firemouths, but also possible from almost anything else I guess.
This same EBA killed an Oscar and a Salvini the same night 2 months ago. Never stop learning, right? Fish never cease to surprise me.