If Hezbollah was not involved in the planning, I can understand it not wanting to be drawn into Hamas' battle with no notice. Nonetheless, Hezbollah has struck Israeli military sites in the occupied Sheeba Farms (with precision artillery), and has apparently informed Israel via Egypt that it will escalate if Israel launches a ground invasion into Gaza.It did not. I can assure you that. Hamas military chief asked Hezbollah and others to join in a public statement. It seems Hezbollah is so far hesitant to join which is saddening but things are developing fast.
Hezbollah involvement would be far more extensive if so.
The more resources Israel commits to Gaza, the more vulnerable it will be in the West Bank (disappointingly quiet at the moment) and in the northern front. And how does Israel recover the 130+ hostages in Gaza? A total occupation of Gaza is surely too expensive and difficult, so they will be forced to negotiate at some point, or accept their deaths. Ironically I have read that the IDF was so slow to respond to the initial infiltrations because it had concentrated so many troops in the occupied West Bank.