You're delusional. 1. That's just your version of why Davis made such an improvement. He was actually gradually getting better every year and with him coming into the game at 20 realistic people knew there would be growing pains. 2. In 7 games Crabtree had 427 receiving (subtracted the 11 yards on CK's pass) yards with Alex Smith behind center...In 10 games with Kaepernick 880. That's 61 ypg with Smith and 88 ypg with Kaepernick starting.
I have my opinion so don't go calling me delusional fuck head.
Once Crabtree got healthy and put in an off-season he looked like a different player. He was no longer running in sand and actually had a burst. He was getting a good thing going with Smith before the QB switch. If you think he didn't transform as a player prior to Kaep then that is on you. I don't agree.
I went to the training camps and saw Davis up close and in person. You can tell the difference in leg development with him like night and day. There is a reason his footwork excelled this year. He was putting in more work than he had. That isn't an age thing, that is a dedication thing. He is still an immature kid so your age thing holds no water.