A few people above have been discussing this, actually. The numbers look good on paper, but there's a fair amount out there now about how his numbers were garbage-time inflated.
'On-field problems are probably the bigger problem. Although Kaepernicks raw passing stats (16 touchdowns and four interceptions last season) dont look bad, the reality is he played poorly and compiled his numbers mostly while trailing in the second half for the 2-14 49ers. More advanced statistics used by Football Outsiders and ESPN both rank Kaepernick 30th among NFL passers last season.'
As I said above, you want a guy who gives you a reasonable change to get you to 2-2 over a four game stretch. Matt Moore is the platonic ideal, and I see CK as 1-3 guy. He's hardly the worst backup option, though--it's pretty clear from current NFL rosters that solid backups aren't that easy to come by.
This simply isn't true. I'd take CK 30 times out of 30 over Manuel. Manuel is terrible, although he may actually be better than Connor Cook (who looks terrible).
I was actually being a bit tongue in cheek about that, about EJ being better. But think about it, why would the Raiders choose EJ as backup over Kaep? Politics?