I saw this 8-10 yo DSH yesterday. This was the poor kitties first COHAT. I extracted 104. I left a small amount of the apical root to resorb. Was this ok?

Also, thoughts on retained roots of 307and 407? Gingiva over roots was quiet/normal. I left these teeth since there was no evidence to support any periodontal lesions and I couldn’t appreciate significant pulp or periodontal ligament space. Anyone disagree with this reasoning?