Interesting that Simmons especially hasn't been signed. He's now 30-yrs. old, but I haven't read anything stating that there has been any fall-off in performance.
I just searched Google, and found an
article where Simmons said the following:
“Honestly, I am looking for a team that is going to give me the best opportunity to play at the level I have been playing at, and on top of that, I am looking for a team that is a contender and is ready to win,” Simmons told The Denver Post. “I feel like I bring a lot to the table leadership-wise but also in my play. I think I can help whichever team it is reach their dreams and goals of winning a Super Bowl.”
That limits his options. Knowing how many teams that he considers contenders, and a fit, that need a safety, is a limiting factor also.
There are some quality safeties on that list that still haven't signed with anyone.