I swear the blonde senpai feels like had a storyline planned for him about feeling envious of Saotome success and how he overcomes his jealousy, because for a while he's had these moments where he makes somewhat of a pointed comment about her or the way she is treated by everyone else.
Sadly the manga, at least so far, is only focused on the main couple and gives almost zero focus towards developing the rest of the cast (For example Mito has been hinted at being related to the mayor and principal and we have yet to see anything come out of that )