Now is the perfect time to evolve Skull a bit; he's been gone a while, had new experiences, and apparently learned at least one new thing about himself. From our perspective it's an unexpected one, and that's what's supposed to make it funny.
I'm hoping this is a long-term thing -- making him less naive and a little (just a little) sarcastic would do wonders for him, I think. A perpetual naif has got to be hard to write for -- he's a one note.
Putting myself in SK's shoes I can imagine an interesting conversation with himself:
I want to change Skull up a bit, and now that he's just come back, it's a good time to do it. But what if the fans hate it?
Aha! Here's what I do -- I try it out. If it doesn't work, I start making him darker, and grimmer, until it's obvious that something is terribly wrong, and we have to go on an adventure to find a way to exorcise the whatever-it-is that's taken him over. Perfect!
Then he would go have tea and cookies with Paul Southworth, but that's just in my head.
All that having been said, I do wonder what's up with Skull's mouth in panel 2. It looks like Phillipe's mouth.
Another nitpick -- Jade's expression in panel three seems out of tune with what she's saying. She looks shocked, but Skull hasn't said anything shocking yet.