I do like the fact that Kubo is helping Shiraishi make some friends. It always felt off whenever a chapter focused on Kubo's friend group, mainly because it showed that Shiraishi didn't have anyone outside of Kubo and his little brother to hang out with. Good on Kubo for helping Shiraishi gain a social life.
Although, I wonder if Shiraishi being friends with Sudo and Kubo trying to hang with Shiraishi while Sudo is around would lead to rumors that Kubo is trying to get close to Sudo? I hope that's not the case, but considering how no one notices Shiraishi and Sudo appears to be somewhat popular in his class, it wouldn't be outside the realm of possibility that the school (aside from Kubo's friends) would assume Kubo would be aiming for the relatively more popular Sudo as opposed to Shiraishi.