The question in and of itself is okay, it is not giving away information, just asking for motivation. And I agree that the motivation isn't clear upfront, since Rome has little to gain from this attack, especially considering the opportunity cost of what else the Praets could be doing. What's potentially not okay is if Whosit reconsiders and changes his actions in response.
It really reads like Morgan is conducting diplomacy on Sullla's behalf and trying to talk Whosit out of the attack. I can certainly understand the motivation: Sullla is going to explode when the Praetorians arrive, and then we won't have his reports to read anymore after he dies or quits.
No harm was done since Whosit is sticking to his plan, but this was very close to going too far.
It really reads like Morgan is conducting diplomacy on Sullla's behalf and trying to talk Whosit out of the attack. I can certainly understand the motivation: Sullla is going to explode when the Praetorians arrive, and then we won't have his reports to read anymore after he dies or quits.
No harm was done since Whosit is sticking to his plan, but this was very close to going too far.