Hmmm, I do agree the execution of the transition to swimming looks a bit upperbodydriven.Legs dangle a bit too much perhaps.
And also the up-down movement of the whipping legs lend itself better to higher strokerates perhaps.
But when i focus on the diagonal twisting drive from opposite leg to other side arm i always get some extra powerboost in my swimming.
Be it hipdriven ore more shoulder driven.
Dont you guys agree on that? And thats the main thing he is training.