"How? "
It was the first word that came into his mouth after reuniting with his cousin. Of course, finding his uncle and his cousin had always been a top priority for him.
When he had a few seconds to spare, he would wish to find them as soon as possible via the "Prediction" function and a Path would thus be generated. Whenever he felt like it, a Path could show him how to find his uncle as quickly as possible. But when it came to finding his cousin, the Oracle device was always silent.
When he arrived in the Mirror Universe, a Path still existed, but when he tried again a few hours later, he received only silence in response. He had not panicked, because he himself was unreachable during his Ordeal, unless the person wishing to find him was in the same Ordeal as him.
I promise, no info dump in the next chapter, just an answer to a question that many have been asking since chapter 1.