Do this trade?

It's really hard to say without knowing league size, but I'm not sure why you seem so surprised Ben was there in the 9th round. If you think you can cough up Rodgers or him for an elite receiver, this is not likely to happen. That's why Ben was still there!

On the trade, you wouldn't do this, but where you're on overload (in a good way) is at RB. Depending on league size your WR corps is much weaker. I wouldn't give up Miller or Gurley, but see if you can come up with a trade that gets you something better at WR.

No, I wouldn't. Floyd would help your WR bench at the likely expense of hurting your starting line up. Further, you would have to drop another player to make the trade. QBs are not a premium this year because there are so many of them that put up good numbers these days. You're not likely to get a fantasy starting WR for Roethlisberger. In all the leagues I've drafted in this year he's gone in rounds 10 - 12.

I don't know how big your league is, but if everyone took top WR early and passed on Ben 8 times, I don't know why you think you'd get a great receiver for him.

I wouldn't do the trade because it's not a good trade.