That's the thing about fantasy leagues. People manage their team any way they want.
Some like carrying 2 of everything just to be safe.
Others, like me don't.
My reasoning is that if I had 2 kickers, I would knowingly be wasting a roster spot on an insignificant position since I will only be able to use him once in 17 weeks.
I, too, have been dessimated(sp?) by injuries, including losing a star runningback the first week of the year. Without 2 quality runningbacks, I feel one has no chance.
So that's why I picked him up.
I'm sure others were waiting to grab him as well. Since I am in last place, I got first choice.
One thing you may want to consider is to go and view the original draft order.
Look at who you picked and when you picked them.
Never, I repeat, never drop any of the first five guys you drafted unless they go down with a season ending injury.
Even if they break a finger or twist an ankle, do not drop them.
They will be back in a week or 2.

Now look at the last five guys you drafted.
Most likely, nobody else wanted these guys because they went undrafted so long so you should drop one of them and be able to pick them back up a week later.
I bet you'll see one kicker and one defense of yours in that bottom 5 as well, that's why I said those earlier.

I hope this helps.

Bill