Strength, size, balance, and quickness. That's what you want in an offensive lineman recruit. He's also one of the few guys his size that does a really good job at sitting down on his blocks. Most high school offensive linemen are so much bigger than the competition that they can just stand up and encompass their opponent without good fundamentals. Also, he has really great hands and elbow positioning.
Ainsworth looks like a sumo wrestler with his skills that really translate well to the next level. If he physically is there, then he is super underrated at 85.