Yeah, that's my impression too. Considered as a money laundering "scheme" it seems incredibly transparent, not to say stupid, though. So, in that sense you could perhaps argue that the players should have questioned what the money was actually for to a larger extent than they apparently did.
Then again footballers aren't known for being razor sharp, I suppose.
Let's say they're charged with having contributed to the laundering of money and/or tax evasion: The punishment for this is relative to the amount of money involved, isn't it? And it would be considered on an individual basis. Doesn't seem like the sort of thing you'd get locked up for, really - on the face of it.