I am not sure it is a contradiction, rather than tactic of application.
K.Costa, has published oodles of material on human system requirements of female gymnasts in landing situations. Here is just one that I have found as a valuable reminder to me as I plan my yearly periodization training: http://www.google.com/url?sa=t&rct=...=yL8Bod4x5wx9rsEhOFbRaA&bvm=bv.57752919,d.aWc
. The fitness, and landing technique are the practical considerations outlined by the techno-weenie research. Female gymnasts mitigating large landing forces need to utilize many joints to be efficient. Top female gymnasts utilize a larger range of flexions/extension than less skilled gymnasts. With ground forces as high as 14 times athtletes mass larger range and greater joint range to managa a safe landing. Knees are a joint at risk for our female gymnasts. This is obvious to all experienced coaches/judges. This awareness has the daily coach strengthening quads, hamstrings and counting impact reps. Since most coaches focus strongly on core, back, chest and quads, articles and research like the above has reminded me to work the hamstring muscles that control the ecentric flexsion forward of a landing. (The hamstrings increasingly resist the knee flexing forward. )I have found that focus on hamstring flex and strength has made my athletes safer to handle the higher ground force or valga forces with more complicated gymnastics landings.
I see BB skills as potentially having different landing technique required as they generally land with less force. Lots of force, but less than could generated on other events. Since our high end athletes have high end strength and technique they can land a BB jump in structural alignment and link the next complicated jump.
Just different for different applications in my mind. The USA Gymnastics L3-5 code has landings that require strong core strength and technique that is within reach of my team gymnasts. As they mature in the sport, their strength and technique needs to grow also.
Admittadely I have presented a different way of thinking about your question. I hope it adds to the discussion.
Best, Eric -