OK... I get people reflexively giving WI to Walker match-ups... but PA? Because it trended GOP last time? Because it's next door?
FTR - even though I think Kasich is about as engaging as soapy water, to me, he's much closer, in reality, to what people think Walker is. He's a generally popular Governor, with a strong economic record behind him and won re-election strongly in a purple state.
The strongest argument for Kasich, is that he's probably one candidate that you could trust to stop Hillary trying to expand the field cutting off IN, MO etc. But I think the Democratic fire-wall would likely hold up in the end.
Again, predicting PA for the GOP in anything other than a mini-landslide is very brave.