Zeev Alperovitz reports on Twiiter:

They need to try to persuade the Haredi parties to join their coalition, so I get it. I don't like it, but I get it. This just makes them like the Likud, on religious matters - just outsource the entire thing to the Haredim and dont get involved. They can promise the Haredi parties it won't go to Kahane but will go to someone else - it doesnt have to be promised to them in advance, while they are saying they wont join a Gantz coalition. Negotiate positions after elections, not before. And if the Haredi parties still refuse to join, would he then give it to Kahane? Would they then accuse him of breaking a promise?