Actually it wasn't Ferrari's heir but Fiat's that went on rehab.

Concerning Porsche's management seating on a competitor's board, I think it is pretty normal. Porsche is now VW's largest shareholder with 18.5%, slightly ahead of the State of Lower Saxony.

Porsche has spent Euro 3.5bn to buy this controlling stake I believe they have the right to get an appropriate representation on the board. I also think Porsche will help VW's management to focus on profitability and cash-flow generation rather than embarking on frivolous and ill fated projects such as the Phaeton, Lamborghini, Bentley, Bugatti, ....