There have been stretches where Sam gives up on the receivers or focuses on one guy too much because he doesn't trust the others. The problem with that is that you cannot win when you go into a shell and if he would keep throwing to the WRs they will eventually get past their troubles.
By not throwing to a certain receiver in games said receivers confidence won't be built up and no progress made, plus it stifles the offense. So, in other words. Sam, this is what you have to work with, so work with them, don't exclude them, because they dropped some passes.