YYA> If ALL the Gedolim agree wall to wall on something
I have a cute “mathematical” proof here.
Axiom: when all gedolim of one generation gather on one street of Yerushalaim and daven together, Moschiach will come [anybody knows the gemora page? It might be in Sanhedrin. I heard it from R Steinsaltz where he explained it tongue-in-cheek: we do not understand this gemora right – it is only when Moschiach comes, all gedolim will gather together …]
Fact “all gedolim” according to you gathered together. Moschiach seemingly did not come. Ergo, not all gedolim came.
QED
Another possible explanation – they gathered, but did not daven together. I am told that they decided to have tehilim instead of speeches, because there was no one agreed speech, as groups vary widely in the political terms.
PS One of my kids was asked to “daven to support gedolim” and say tehilim at the time of the march. Most kids were clueless what this was about, my kid was not brave enough/did not think it is appropriate to leave the room. Instead, he said tehilim for the refuah shleimah of hostages. Tehilim unite us …