2hr. before wire goes off...drop J. Knox?

[spread eagles]

I am in a 14 Team league:
QB-Shaub, K. Collins (dropping for M. Cassel hopefully)
RB-LT, Westy, Mendenhal, McCoy, Beanie Wells, Bradshaw
WR- B. Marshall, Colston (on bye), J. Morgan, J. Knox (on bye)
TE- J. Witten
K-Folk
DEF-GB (on bye so dropping for PIT)

Since colston and Knox are on bye it leaves me with J. Morgan, B. Marshall as my starters.

Would you drop knox to pick up Avery, Mo-Ma (doubt I have priority to get this guy), Collie, Coles, Mike Wallace. Slim pickings if you know what I mean.

or would you roll with a WR3 for this week?

I think my top priority claim this week is going to be M. Cassel, then Pitt, then a WR.