UFA's vs players that were cut (1 Viewer)

I'm sure the Sharks here know this and can help me out. I understand that teams need to get their cap number down by March 10th so a lot of veterans get released early and I also get why some players can be cut now with the June 1st designation so they can be a part of free agency now and not be behind the process. What I don't get is why can players that are cut start signing with teams now but actual legitimate UFA's have to wait until free agency starts on March 10th? Darnell Docket is a 49er already but Suh has to wait 5 more days (just as an example).

Contracts end when the league year ends so still are signed to the present team. Only the current team can negotiate with them until then. Released players don't have a team owning their rights so can sign whenever.

Makes perfect sense. Thanks.

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Been wondering this myself, thanks for starting this thread.