Thanks for checking Carla.
With all the recent bullshit I can't say I blame him, but this place just won't be the same without him.
This Rupert Pumpkin guy looks like a good replacement. 
No offence meant to him cos he seems like an OK person, but he'd make a poor substitute. 
There is only one McJ and he is irreplaceable.
Just like there was only one Litigious for example.
I don't think people replace other people, because everyone is so different. I assume you didn't mean to be insulting to Rupert, rather that he is completely different.