I think Kerrigan is the way forward too but his technical issues will be a major worry at international level. His ability to bowl six balls on the same spot with that action... You have to grimace.
International players are better when they are a little cocky, arrogant and ignorant. Swann was NOT the 'best' spinner in the world (Top 5) but his self belief was second to none and as a spinner you have to have that - especially when you are getting tanked all over the place.
Kerrigan's biggest issue in that game was temperament. Swann as a youngster was the same - came good later in his career. I think Kerrigan will be the same. Just needs to bowl, bowl and bowl some more.