will he join bibi?
See above. He may be aligned with Bibbi somewhat but Bibbi isn’t stupid enough to form a narrow & fickle coalition hinging on Ben Gvir & Abbas together. If Abbas joins, it will be with Saar, Gantz, or Michaeli (in that order of likelihood).
Something to remember is that Ben Gvirs partner Avi Maoz was sent by Rabbi Tao who believes it’s his mission to stage a protest in the Kennset, and thus has no interest in compromising...
While the political participation of Arabs sounds great for democracy, every bit more accepted they become may Ch’v lead to increased intermarriage, and will hasten the inevitable point when Arabs in Gaza & the West Bank demand Israeli citizenship instead of their own state, which is by far the greatest threat to Israel as a Jewish country - much more than Iran.