Fett rode a Rancor info battle in the streets because the people of Mos Espa needed to SEE Boba Fett protecting the city, not a ship blasting up in the sky that the people of Mos Espa may or may not have known was his. He has much more credibility going into battle himself to protect his people.Definitely I think the reason they didn’t go that route was because there was too many innocent people in the streets
At least that’s the only thing I could think of