Trust me on this, that amount of positions for Rockstar North is crazy unusual, there's a large amount of long time time who have quit the studio over the last year, if related to the Benzies incident or not, it's highly curious how plenty of long time veterans who have worked on either all GTA titles or even ALL Rockstar titles have decided to leave. There's also been a key amount of people leaving San Diego and most recently the artwork and brand designers at Rockstar NYC have also left, including the person who designs the covers for Rockstar Games.
Whether people want to admit it or not, 2014/5 has seen Rockstar Games lose a crazy amount of people and there's PLENTY of projects that were shelved that haven't been picked up yet (titles such as Bully II, aGENT, unsure of the status of Project Remorse though).
As a person who was linked with the web team for Rockstar Games from 2007 to 2015, all I can say is that the stories you hear about the how these places are ran and the weird choices made are often true, the split engine design for Red Dead Redemption with no documentation and rushed patching being one of them which makes porting that title a complete nightmare.
It's not just Leslie Benzies who's gone, but people such as Adam Fowler, Craig Conner, etc, as well, who each had a part in making Rockstar Games titles feel a certain way. It makes me curious about their direction and the next couple of games they get around to as this is really a point where Rockstar Games has gone through a massive shuffle for the first time really since 2000.