Well, looking at it from a 10,000 foot view... it's not as if Tony "can't" move tight..... It's that he doesn't necessarily want to. He wants to shoot, and will leave a little air on the cue ball if it allows him to shoot for the pocket, versus 6 inches to the left of the pocket, for example.
Dennis, on the other hand, is in this for the money, pure and simple. I don't think Dennis has any great love for One Pocket.. He is mostly in love with the money it brings. Dennis is more likely to opt to freeze Chohan on a ball, and if the OB goes a little long, and sits on the top rail, no biggie.
Looking back, it always seems to me that Chohan only ever learned the One Pocket moves in order to get himself to the next shooting opportunity. The problem is... Tony is a supremely talented player... With high shortstop-level fundamentals, not more.
Which necessarily limits his effectiveness on his moving. When you are 6-7 feet away from contact, and need to get a frozen ball on a crossover safe.... Fundamentals are key. They carry over into all parts of all games. It is very, very, VERY rare for one person with significantly better fundamentals, to lose any game to a player with lesser fundamentals.. Any knowledge advantage wears off very quickly, and if the player with lesser fundamentals can't finish off the other player quickly, they likely lose.
And here's the thing about fundamentals... They break down if they are not the sole focus, and heat is applied. And that's the difference between Orcollo and Chohan. Chohan likes to shoot, but he doesn't like to practice. Orcollo is a practice machine.
So, my short answer to your question is... I believe that Orcollo executes EVERYTHING better than Chohan. In a difficult layout... Orcollo will get a ball or two more.. He'll get a hair closer to the blocking ball on most safes... The "loosey goosey" nature of both Chohan's and Scott Frost's stroke betrays them under pressure.
What say you, SJM?