I'll play one round in this game: in the first video (Christopher Rownes') there appears to be no fly, no sink tip. The forward stroke is inclined outward from vertical (especially in the single hand casts), and when filmed from a low downstream camera angle it makes it appear to be a tighter loop than it actually is, since the loop is forming partially sidearm (which, not coincidentally helps prevent tailing loops). Not saying it is purposeful slight of hand, just pointing it out. If you try his high hard stop with a heavy sinktip and a heavy fly, you have what is commonly referred to as a "mess", since gravity acts on the sinktip whlle in flight, pulling it downwards onto the outgoing loop, only forward velocity saves the tailing loop. Ed's final cast is cackhanded, which forces the rod tip into a high, flat plane for an extended period, which assists in forming that upward-tilted "tight" loop. If you watch his strong-side casts in other videos, his forward delivery is low and slingshot when casting sinktips and large flies. In Ed's video, with the constant tension he supplies, if he didn't have a sinktip and a gnarly fly, he might have trouble holding the anchor, given the continuous pulling on the line during the cast. Further, Christopher's rod is a Loop scandi stick--designed to yield an advantage when throwing tight loops on floating heads. Ed's rod is similar to the dredger taper--more of a catapult with a softer midsection and relatively stiffer tip. Tight loops may or may not pack the most energy (velocity and mass matter, too), but they look pretty and are drag resistant. I've seen many slow moving tight loops that could barely carry a leader, let alone a sinktip and a big fly! I would suggest these two casting "styles" are purposeful for the result intended with the added notion that the parts are not interchangeable. Apples and Oranges.