I think most of the Pro's are versatile enough to play anywhere. Ive seen Scroggins play inside of 10 a few times. Seen Walter Ray play inside several times as well.
I think the versatility helps make more shows consistently. Guys like Duke, Voss, Walter Ray, Pete Weber, And without a doubt Chris Barnes are on tv more than anybody else because they are never "locked out" so to speak. By being versatile, it gives them more options, which in turn gives them more opportunity to make shows Consistently.
Guys who refine their skills to one set style or shot are limiting their chances of making shows. Take Dale Traber for instance. First, Dale is a great bowler, a lifetime better than i'll ever be. Dale is one of if not the best at playing the outside portion of the lane. When you give him that shot, he'll make the show probably 90% of the time because thats his bread and butter. Force him to move inside, and his chances drop alot.
On the other end, guys like Chris Barnes are never really shut out. He can go from playing the outside like Traber, to playing 5th arrow like Robert Smith in 1 frame. Then, all it comes down to for a guy like Barnes is ball matchup, because he has all the physical tools to play anywhere on the lanes.
What you really need to do is attend a PBA event in person for a few days. What happens during the week is ALOT different than what we see for a couple hours on tv. A couple friends and myself attended our first Pba event in 1996 in Hampton Roads, VA. I wish i would have had a camera to capture my friend Alan's face when he saw WRW playing inside of 20, it was priceless to say the least because he always bashed Walter for playing straight.
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Taking your lunch money, one strike at a time....