Look at :52 in the first qtr..Barkley gives him the sign to go deep after breaking huddle...Foster ran the route of the original call...no excuse.
Also..His drop in the flat from Barkley was something that doesn't happen to solid wr's either...at least he broke free from the coverage..but the ball did hit his ten fingers and boof.
Right now..he's still a one trick pony who needs to know his playbook better and become more alert.
Imo..Foster is #6 right now.,nothing more,nothing less.
Kudos to McKenzie for having a solid night.