Ben Afra is a maverick but I would take him on loan for the rest of the season. However, signing mavericks at this time of the season doesn't alway work. Look at Newcastle in Jan 96 when they signed Asprilla from Parma, they were 12 points clear at the time of his signing, only to end up blowing it by May.
Having thought again about Pato, perhaps his potential signing would not be as good one initially imagined.
Rarely has a player gone from South America to Europe to South America back to Europe and done well.