This applies to any FA anyone brings up though. Every player who was ever a FA was, at some point, eligible to be drafted.
Look at a guy like Kyle Williams. Many, myself included, are hopeful he can be a contributor this year and beyond. He could go on to be a HOFer but it will still never change that we essentially got nothing out of him as a rookie. No significant, meaningful contributions really. That can happen with any rookie - even good picks sometimes take time to pan out. And some end up total busts.
So yeah, you can turn your nose up at any FA thinking you can fill that spot in the draft, but the cap space just sits there if you don't use it so you should always be trying to add talent where you can.