I think it says a lot if...
Miami doesn't bring him back at least for the vet minimum. I think it makes sense at least from a depth standpoint, however it speaks volumes about the confidence the coaching staff, especially Tony Wise have with the young talent we have already.
Despite Nails blowup at the end of the year, + with DW on the hot seat, I doubt DW would be stubborn enough to not tell RS to make an inquiry about Nails simply becasue of the blowup. I truly believe either one they're waiting to see how their current roster shakes out, two an injury, or three after June 1st. The phins organization is notorious for making their UFA wait especially if there isn't any demand for them. The longer they wait, the cheaper they become.
At this point there's no need for them to rush out and get him. i could see him being signed during training camp to push one of the rookies and battle for a starting spot, but K.I.M he's not going to beat out James and I'm not sure sure how he'll fare on the right side, besides, despite his injury recovery, he sucked last year and maybe they think he's just a one year wonder.
Either way I trust RS's judgement.