Events at Hercules

Am I the only one questioning why they brought out just one Dreadnaught? I know Skippy explained that each ship requires an Elder AI to control it so Skippy could not control more than one. However, Nagatha was also nearby hanging out with the fleet. I feel like they could have gone out to get her and let her command her own ship.

Is it just because Nagatha doesn't have full control of her substrate yet (she cannot control Sentinels)? She is in control enough to receive the activation codes (that weren't for her). Maybe the Fortress AI or ship AI would reject her? It bothers me that Joe didn't even ask Skippy about it.