Decided my answer was a bit short.
I though it was interesting that you weren't sure if Johnny was so sweet and funny because he was still being Gilbert or if that was the real Johnny. Johnny admits that, like Gilbert, he was going through a rough time then, and it's so nice to know that, again like Gilbert, he kept his sweet nature.
And how perceptive of you to know the real Johnny through his reaction to your little grandson!
As Xaxis so wisely said, "A little method, a little madness and a little bundle of joy. What more could any set ask for!