Think people need to calm down when talking about young players, and AWB is still in that bracket.
It is important to remember he played for a palace side that were never very attacking, and he also was paired with Zaha, who is very good as a solo attacking threat. All he had to do at palace was his defensive duty, which he did very well. He started the season strong in defence, but not very good in attack, partly as he seemed to lack confidence and seemed to hesitate to go forward in fear of being caught out of position.
It is obvious that the coaches have been working with him to improve his attacking game, but also important to note that not having a good RW is just as much a problem for AWB as well. Today, the fact that Greenwood could keep hold of the ball even when he was marked was helpful to AWB as he could get up the pitch without worrying about being caught out. Having James as a partner was probably not helping either, as he is fairly light weight in that aspect.
He will keep improving,and even though he may not put up the same numbers as TAA, he should still be a very good RB for us. We also have some more attacking alternatives at RB in Dalit and Laird.
Overall, the RB position is looking very strong currently, and AWB is improving with time.