I would wait to hear what Chaim would have to say about this on the next ask JTF, but those of you who can vote, I would muster to guess that he will say that the goal is to weaken Likud with a new party, which might be Bennett's party.
I think the problem with Eli Yishai's party is that they are against Jews going on the Temple Mount. There is a major issue with having religious Jewish leaders who act on fear of Arabs.