get pp VS be pp

1. John was arrested by Mary on purpose.
2. John got arrested by Mary on purpose.

Q1) Is there a difference between #1 and #2?
Q2) Can a context make a difference between the two?
Q3) In #1, is "on purpose" focuses on "Mary?" i.e. John was arrested, not by other person, but by Mary on purpose.
In #2, is "on purpose focuses on "John?" i.e. John on purpose got arrested by Mary.
Q4) Perhaps there will be no difference in meaning between #1 and #2, if "on purpose" is placed between "was(got)" and "arrested", won't it? (John was(got) on purpose arrested by Mary.)