So, I think that maybe, Realise Phrase is gonna have a major shock in the story.
First, there is the aspect that, very likely, the fact that the skill exists will leak. When you consider that, more than likely, Freya is going to kidnap Bell, and definitely succeed, there is no way that she won't take a look at his status. I mean, she already considers him as hers. And well, if she does see it... I'm not seeing her reacting well. Like, at all. That skill pretty much says that Bell is meant for Ais and that he grows stronger for her. That would be quite the slap in the face, especially when you consider that virtually everyone in the Freya familia grows stronger for Freya and she is constantly asking them to grow stronger for her. This would also probably reveal the immunity to charm to Freya and the entire Freya familia (can already see their pikachu faces). Freya may take some rash decisions because of this and it may lead to the information of the skill being revealed to Orario at some point.
Now, I've seen some people say that Realise Phrase was going to suffer some set back, mainly because of what Oomori said in an interview. I thought that probably the excuse was already done, with Hestia refusing to level Bell up, but... then I noticed the aspect of: vol 16 was out. In other words, Oomori probably meant that the excuse was still going to be used. And when taking into considerantion everything we know so far of this vol... I think Bell's feelings for Ais may suffer some damage. After all, Realise Phrase works on his feelings for Ais. So, really, the only way for Bell to actually stop grwoing stronger so fast is if his feelings suffer a major setback. Of course, this might seem like bad writting for Oomori's part, which he himself basically admitted to be, but then there is another aspect: this opens the door for another arc. We might get an arc on Bell and Ais's relationship. I mean, this is too good of an opportunity to miss.
I had some other things to say, but that is more fanfic than an actual theory, so I'll leave it out.