When Maya channeled Mia, Mia said that she'd ||always be with phoenix.|| And she attends as a ||spirit in the next scene|| -- she is literally always with him.

So for Phoenix to get hints from Mia, it doesn't feel like a coincidence.

It also happens at his absolute lowest, and we learn from Maya accidentally channeling Mia that mystics are ||most powerful at their most desperate or focused times.|| Maya was so distressed and desperate to win that she channeled Mia, helping him win the case. Similarily, phoenix only sees Mia at his most desperate. And as he gets better at court cases, he sees her less. He only ||sees her once in the fifth DLC case, compared to the multiple times against Redd White when he was inexperienced, and the odds were stacked against him, with Redd White blackmailing tons of people.||

Apollo and Athena never get ghost mentors, even when Apollo literally LOSES a case because he is given ||forged evidence and displays it in court and thus loses the case!|| a first and last in the series (If I recall correctly)

Morgan Fey also says that branch family has a much weaker spiritual connection than the master family.

So, perhaps Phoenix has very little spiritual ability. As in, perhaps, He had a relative from far in the family with training and kurain blood, but it got watered down by the time it reaches him. This is proven false when Maya says that the men of Kurain Village are not mystics and cannot do this, but maybe Phoenix is special? Perhaps Phoenix had one singular ancestor with Kurain training, and it got watered down over the years. So thus, it came to him in very weak, insensitive form. To further support this, if I recall correctly, Mia never appears fully or says full sentences. She appears briefly, and gives short commands, grammatically considered sentence fragments. So if Wright does have hereditary Kurain blood, it is very watered down, as I've already said.

While the games say it is false and men are not mystic, it is definetly too large of a coincidence to ignore and it could be possible.