Hmm, Soma reminding her of Jouichiro in this moment personally did not bugg me that much. He's his father's son after all, so it shouldn't come over as a surprise that some of his mannerism reminds her of Jouchiro.
What I am personally concerned about is when Erina will find out about Jouchiro being Soma's father. I'd prefer it if she finds it out after they've become friends. If she finds it out before that though... Hmm, could feel as though she's just now gotten interested in him b/c she officially got to know of Soma's blood relationship with Jouchirou.
That's what I'm hoping too, that's why the scene of being reminded of his father kinda put me on edge, up until this point it was his own actions that got Souma on her radar, and why I was satisfied with Souma's response last week, because I felt Souma's actions had to be his own, not a request of someone else that motivated him. I think that's why Jouchirou never got the chance to tell him the true success of cooking to him, because the manga was meant to progress with Souma discovering the truth himself, and his response to Nakira senior showed that, he wanted her to admit it was good, this is probably also hinted at with how Souma seems to go to Erina to test his dishes out, it's meant to show his subconcious mind cooking a dish she approves of and wants to eat.
However that's on Souma's side, Erina has not been the same she seems to be on a path to deny his cooking, and this first time where we might see her willing to accept it, we are shown her being reminded of Jouchirou. Ofcourse there is now the possible stumbling block of her feeling gratitude towards Souma if the route taken shows him saving her from her hell, that's why I feel it has to be him supporting her but Erina saving herself from her nightmare. It's why I don't ship Megumi because early on it was him saving her, until she was strong enough to walk her own path where I like the idea of Hisako more now because he helped her in a different manner and only gave her the excuse to get her moving in the right direction, she moved there on her own.
Also just to be clear I made my comment knowing the love hearts in her eyes were photoshopped. That imagemanip had nothing to do with my argument.