Here is my analysis:
Time: 17:30 - 1738
roughly 5pm europe time, past the 9-5 general business hours . If all the parties or just the reciepients are based in europe, between legal and illegal.. I would tap this as illegal. It just doesn't make sense.. for someone doing a legal transfer of this size, after business hours, unless.. senders were based in US.
Going through the direct senders (1 step back), the time with least 1k BTC+ transactions was 0200, 0400, 0500.. while with most big transactions were made around 1300, 1500, 2100 .. suggesting that these transaction were roughly either made from US to Europe, if of legal nature.. or within europe.. suggesting something shady. Very very crudely speaking.
Yeah, everything is possible, and the above is not necessarily true, but it appears so, at least to me.
Amount: 194k bitcoins
Multiple connected accounts who sent to the above address seems to have had 220k+ in total recieved and looking at denomination, it didn't seem like lot of normal people were involved. Besides, with this kind of money involved it is wise to have 10 or less people involved who are highly trusted. This appear so also, with how countable no of bitcoin addresses were used to say "bounce" the trace of that money. Skill wise, these are not normal people.. but given HOW this ended up in public domain, they could have done slightly better.
I get the feeling you get from govt hired people doing such things, no offense.. but somewhere below the elite, but above the average joe. It is also possible that a bigger or equal (more likely) sum was also transferred elsewhere.
Movement seem to have stopped.. due to attention it has already garnered or is it the actual resting place? If it would be illegal, one would have had no problem keeping it in multiple bitcoin wallets in smaller amounts. But if it is someone, with legal force on side.. say govt agency, it would not have problem leaving the bitcoins in such limelight, for a long time, as long as they believe that bitcoin is actually 100% and not 99.9999999% impregnable.
Motive, as discussed slightly above, can be mainly either "convenience of centrality" > or > "hiding a bigger sum" .. well I at least won't be putting my money in BTC for my own reasons. I got that feeling today to use it.. but I resisted.
BTC is genuine, but the currently it seems like a pyramid fraud system which is perfectly legal strictly speaking. More people putting in money in BTC system.. already rich getting richer.. tickle down effect :? Well 150 million.. has really left a lot of questions .. or its nature, motive, ownership, moral, etc. Who would answer? No one.. ironically.. thats a big problem as well a big benefit of BTC. I'm sorry.. lot of things I said above are based on feelings, but to tell you the truth, before today, BTC was in a nutshell somewhat easy to understand.. but 150 million.. is a figure that can give any guy a lot of different vibes, speculative as well as wild goose chase type.