Here is a link to an article I have referenced before, "How To Swim Faster Without Injuryhttp://www.swimsmartsa.com/How_to_To...rm_paddles.pdf
" by Fred Drennan, written in 2007. It basically validates the elbow swing recovery that TI teaches. It takes a different approach to shoulder injury than the article you referenced, which seems to be more focussed on the catch and propulsive phase. Properly executing the high elbow, early vertical forearm, will also alleviate the stress in the shoulder area.