It's an interesting decision for Mari to leave Seki. Mari shouldn't be looking into romance as her first option. She's so socially inept, after all. Going for someone like Pon and being friends with him is a better idea. From there, she can much better approach people without needing such specific instructions from Kon. Kon isn't a counselor, after all, she simply deals with making people fall in love.
First impressions are a good thing, but unfortunately, these can all change because of drastic actions. Seki may have looked like a good quiet guy, but because of his actions, Mari realized she may not really know him. So now she asked Kon to tell her who Seki really was. And now that she knows, she's unsure of pursuing a relationship.
Poor Seki though. He just wants to help her. What does Pon have in mind that will help him still stay with Mari?