I have a feeling it was a background deal, hence the complete collapse of resistance,

It was definitely a deal, just it is not clear what this deal was about.

• Western terrorists allow Assad to flee to Russia without any problems. That's not what Western terrorists usually do with hated leaders - recall Gaddafi, Hussein and others.
• There was no resistance to collapse. Only few accidents and clashes in such situation. Syrian army just lay down guns and turned into civilians. Syria is relatively large country, 500x500km approx, it would be at least months of battles if any, even tiny unorganized resistance would have taken place.
• There is no much cleansing ongoing, at least for now.
• Crucial information in Syrian Intelligence Agency, Internal Affairs Agency and other Agencies was immidiately destroyed by Israel. That's not what you do with most critical information storages of your rival. Especially if you can fabricate anything about your rival if you get your hands over all that special agencies archives. Now there is no archives that could be used in anti-Assad propaganda, and it was Israel who destroyed them.
• EU countries immidiately stopped giving out refugee statuses to syrian immigrants.
• Russian bases in Tartus, Khmeim and even Rojava in Kurd region was never attacked and Western terrorists never even approached them, also Russians freely move aroud Syria controlled by Western terrorists posting photos of abandoned Syrian Army weapons and uniforms. Russian troops decided to abandon only Rojava base for now, nobody stop or oppose them. In Telegram rumors circulating that only minor injury among Russian troops through all this thing was some Russian officer who was punched into face by his colleagues when he began to panic watching TV news and agressively demanded urgent evacuation.
• Russian embassy was unusially too calm about situation and don't issue any warnngs to Russian citizens in Syria. Only few personnel was moved out, and without any hurry.
• Russia immidiately gave Assad asylum, that means all paperwork was ready before. Russia is very bureaucratic, it would take at least week to officially give an asylum even for Assad.

And so on. If it was Israel/US/UK deal with Russia, then Assad participated too, hence no any Syrian Army resistance.

Also interesting that it was Assad who previously didn't allow Russian forces in Syria to shoot down Israel planes bombing Damask. Our guys was ready to do it without any problems, you might recall loud Israel whinning about Russian AD locks on their planes, and it surfaced finally that it was Assad who didn't gave his mandatory green light for that.

If, and it is big IF, that it was kind of attempt to pull Syria from under the US sanctions pressure and make US/Israel rethoric about Syria completely void, then it could have some sense.

Also, interesting that Syria don't have an IMF debt at all. It was paid out with some help of Russia from inside IMF few years ago. It will be interesting to see if Syria will loan money from IMF soon.

And many other things, that just don't fit into any more or less solid theory.

just keep watching the actions. Don't mind what they say. They will all lie - constantly. Incl. Russia.

Exactly. Something strange happening, and it is still completely unclear is it for bad or for good or who win or lose.

Will see, how things turn out, and who will benefit eventually.