Read most of the stuff out there. We have no problem building strength and mass (see the link at bottom, he’s my 20y.o.). The trick is that while I fully realize quickness and acceleration/speed out to 30m is key at any position, and we do see improvements in quickness and speed, how do we optimize the training to get the best combination. Reading Charlie’s work has allowed me to understand that you can’t move all things (mass, strength, power, acceleration, and speed) forward maximally, all at the same time. There are tradeoffs. So I’m constantly in learning mode trying to determine how best to distribute the training for a specific athlete in order to optimize that athlete’s training goals.
As an example, the athlete in the link below has left football (injurys) and his focus is powerlifting. He does no speed training other than pushing a sled. If his focus were to maximize acceleration and speed, he wouldn’t be making the gains in mass and strength that he has; he simply doesn’t have the CNS pool to accommodate the additional stress, not to mention that the weight training that he does would be a huge impediment to developing speed (recovery issues).