I hope Diggle being GA lasts for a few episodes though (and Oliver gets to be a dad for a bit). I'm curious what Diggle would do different. I don't think Diggle would be a bad GA...he's always been competent. I'm hoping they're not setting it up that Diggle is so bad at his job Oliver has to retake the mantle. I'm sure Diggle could do some things a little more competently than Oliver.
I think it will be due to his injury. Diggle may end up killing an innocent and will have to stop being GA.
Or something happens to Oliver's kid and Oliver gets into a rage and suits up again.