Its called a learning curve my friend,
Once upon a time QB's progressed along a 3 year ( starting time frame) before the game begins to slow down and everything a QB has learned kicks in. One or two have early success and now everyone is supposed to hit the field running.
In the real world nothing has changed including the average amount of time it takes a young QB prospect to adjust to the NFL in my humble opinion AFL, and no, sitting on a bench doesn't help much, not IMO.
Throwing with anticipation takes time and practice throwing in the same system to the same play makers.
Myself personally, Taylor has already begun to show good chemistry with Clay and Watkins.
Boldin is key ...