What's interesting is that Kulanu, which Bibi would likely need to cross the threshold to stay in power and which may not actually cross the threshold, has been very quiet when everyone else in the Kahanist alliance has promised post-election support for Netanyahu as PM. If that Times of Israel poll is correct, Gantz could get a strong and stable majority with Kulanu's support, and he wouldn't even need the Arab parties to do it. I don't believe that Kahlon wants to be part of a leftist government, but give him the treasury and ostensible veto power on legislation (as there is no majority without him) and you may very well have the first center left government in almost 30 years in Israel.
But I still think a national unity government under PM Gantz is the end game here, especially for Kahlon, and probably for Gantz/Lapid, too.
It's obvious that a center-left coalition including Kulanu would be the result if that poll actually came to life. After all, the right even including Kulanu does not have a majority (B&W+Labor+Meretz+Arabs is 65 seats) on that result, so B&W+Labor+Meretz+Kulanu is the only realistic coalition other than something a bit crazy like the religious parties with B&W or a B&W-Likud "grand coalition".
That said, I'm skeptical until we have more polling.