It means one is an undrafted rookie playing for essentially no money and the other is a seasoned vet with an actual resume of doing something who commands somewhat of a decent buck and a salary. That's what it means.
One guy is a scrub who is lucky to be on an NFL team other than the fact he makes no money so he is easy to keep around to play special teams and the other guy while not Jack Lambert has done a few things in this league and is a decent player. If you want the decent guy with the resume it means you have to pay him a fair wage not like an undrafted rookie. That's why he isn't on a team and will be between now and early September, whether its with Miami or someone else. He is waiting for the right offer from the right team
So then implicit in your response is that we'll have to wait and see whether 1) he's signed by a team, and 2) the salary he's given. You're presenting yourself as knowing those things beforehand, however.
It's also entirely possible that 1) Maualuga plays a position that represents a "dying breed" in the NFL (the two-down run-stopping linebacker), and 2) he isn't that good at even that position anymore, meaning that he could simply have no career left.
If that's the case, then holding out for the kind of money you're talking about here -- if that's indeed what's happening -- may just be what keeps him out of the league completely, and the Mike Hulls of the world will have careers instead.
Here is some information that's consistent with what I said above:
Free-agent inside linebacker Rey Maualuga visited the Chiefs this week but left without a deal, a source with knowledge of the visit told The Kansas City Star.
Maualuga is the second known inside linebacker to visit Kansas City during free agency, an indication the club continues to seek reinforcements at a position that contributed to the Chiefs’ No. 26 ranking against the run in 2016.
http://www.kansascity.com/sports/nfl/kansas-city-chiefs/article142185864.htmlAgain, the way this relates to McMillan is that if a player such as this (a two-down run-stopping LB, which is all McMillan was going to be this year) can't command a hefty salary, then the loss of such a player by definition can't have extraordinary significance.