Naah. You guys are confusing two very different canopies. The SINGLE Keel 'Dactyl was the most amazingly small & lightweight canopy of it's day. Unfortunately, it occasionally demonstrated some real "blue skies, black-freekin'-death" weirdness. (Like collapsing in turbulence.)
But the DOUBLE Keel 'Dactyl was fabulous! With about 1/2 the bulk and weight of a PC, it had far better performance, especially on landings. It was a delight to fly, docile, super-light on the controls, and amazingly reliable.
For several years, my New Dimensions Flite School at Perris used double-keels for all of our AFF students, right from the first jump,
IMHO the DOUBLE-keels were the very best student canopy of the day. (Just my .02 worth.)