You should be fine with Kaep and Roethlisberger as your QBs. But forget Manuel and Cassel. If Jake Locker is on the wire, get him. If you need a 3rd (and you should for a 2 QB league), go after Locker, McCown then Manuel, in that order.
This is how you learn. All year you will be wondering and learn exactly what should have been done.
Jake Locker is the best QB no one wants. You didn't say how many teams are playing, but if it's 12 or more you already waited too long for a backup. I would dump Reed for either James Starks to handcuff Lacy, or snag West (which you'd better do now since the normal starter is out at least 2 weeks).
BTW, you could do Justin Hunter for Mike Evans right now and come out ahead, but you'll have to deal with Week 9 and three WR on byes.
My team: 2 QB,2 RB,2 WR, 1 FLEX, 1 TE, D/ST, K
Big Ben
Kaepernick
Cobb
Megatron
Lacy
Spiller
H Miller
Garcon
Broncos
Parkey
6 BN:
Sankey
J Reed
M Evans
Morneno
K Benjamin
Should I drop Reed, who is injured for a RB or WR. T West,Freeman & J Hunter are on the wire
Should I bother getting a backup QB for my bench? Manuel & Cassel are on the wire
What other moves should I make?
Thanks
