That definitely sounds like almost the exact opposite of Senku. Inigo is trying to imagine it inside of his head right now, but even that is giving him a hard time. Senku being friends with some guy who practically looks like a bear..

He shakes his head, unable to fully reach the mental image.

"It sounds like you like him a lot, if you're going around saying good things about him like this." Even without said guy being present on the train.