That said, it's sort of beside the point. Unlike petty dictators, Putin holds real and substantial power--power that money can't buy outright, and power that he'll probably continue holding until his death. He doesn't need an exit strategy and a golden parachute. OTOH, he secured much of that power redirecting assets. It's less unbelievable that Putin has deliberately permitted $200 billion of embezzled funds to be redirected to those who do his bidding.
He doesn't need the exit strategy now, but it would be stupid of him not to have one (probably more than one), because nobody knows what future will bring. You only need one charismatic opponent to undermine him.
Overall I think he isn't a bad person for the position he has - he is definitely not outright evil, also definitely not weak and probably quite a patriot. But Russia could have achieved much more than where they are right now, with better leadership. At least in theory.
I would expect that he diversified his wealth all over the world via 'friends', stored in shady wealth management companies, well located banks, and probably few tonnes of good old $$ and gold. Some bankers in one Zurich bank might give you some info (but might not be alive to confirm it afterwards).
But he has good PR - it often looks ridiculous to western eyes, but for most russians it hits some obscure sweet spot. And of course he is not some lone wolf, rather guy on top of a massive pyramid with tons of FSB people who know their stuff a bit too well.
Who else would you be expecting to run huge broken country like Russia for so long so successfully? I mean, even Arafat died as a billionaire, and Palestine ain't some Eldorado to begin with.