I don't think Ronnie (nor Flex) had much of a mind (nor muscle connection) to train with. They just had it.
Dillet "says" he had no shoulder cartilage and any action with shoulders was agony. Think of a BDB and shoulder retraction and you can see where the probelm would be if he is not lying. My front delts and rotator cuff are bad, not fucked, and that movement alone (yes pulling a BDB) hurts badly. Can't imagine you could build much there without genetics and I think he used all his genetic lotto cards already.
When Flex trained he seemed to have it. Remember he also did martial arts (Karate) and is used to going through "movements". When doing the lat pull down, he would do the squeeze at the bottom. When training arms, it was pretty much the same or like we all would train arms. I mean, anybody can train arms or develop big arms, if one has the genetics for it. It's the back that takes more effort to develop.
One thing I noticed is that those who have good contractions and do Lat pulldowns and pull ups have great detail. And those who do lat rows and deadlift, have good width and thickness in the lats. Those who do all those exercises have detail, width, and thickness. Flex didn't go heavy on the rows and deadlifts.
