Yamamoto would unlikely bring that up unless she needs help. In that case, it would be better to offer assistance rather than stand around and watch her struggle. Who knows, maybe he could just... get her a stool to spare her pride.

"Well, I don't know anyone around here, so the more, the merrier!" And he is very eager. He and Kenzi may never even be close, but to him, a friend is still important. There may come a day when she may be the only person he can count on, and he will, even if it's at a bad time or if Kenzi isn't up for it.