A QB can have a great FF game without his normal top receiver having a great FF game.
A WR can have a great FF game without his QB having a great FF game.
For example, Matt Ryan was slightly below average last week.
Julio Jones, however, was awful.
Ryan threw for 256 yards, 1 TD and no INTs. It's not top 10 worthy, but it's not terrible
Julio Jones caught 4 passes for 38 yards and not TDs. For him, that's awful.