Deaf! Ryan Walker
I was thinking what if Ryan was hearing impaired. Maybe not completely but like 60% or so. He wears hearing aids and can hear some sounds, but mostly relies on lip-reading. Mark, Harris, and Spyder know sign language and make sure to always face Ryan when talking.
What if the note Leo wrote said "His name is Ryan and he is also hearing impaired"? And there were some sign language books included in the things left with him. Also, when Ryan activated Mech-x4 and played Leo's video message there were also subtitles so Ryan could read along as well. And Harris was like "how did he know your name and that you are deaf?"
And Ryan's like God gave me crappy ears to make up for my gorgeous eyes. Lol.
Idk. Just some thoughts that came to me after watching the show.