It is remarkable that you claim that the Rules of Eight will have many loopholes but you can not point out one.
I have thought of half a dozen. Some are convoluted. Here are the two simplest ones (not the best, just the easiest to explain.
1.a. Trade players for draft picks. As time goes on, the good teams need never lose a player to FA, their team will get better and better. The lower half of their roster will be looking better than some of the dog teams. Trade journeyman players for fifth, sixth, seventh round picks. Get a lot. Find the occasional Givens/Koppen-quality guy, and hope to snag a Brady/Dan Hampton quality guy.
1.b Trade for another teams UDFA that shows tremendous promise. Give up one of those sixth or seventh rounders you acquired in 1.a. for a UDFA. Not a problem with rule of 8 because you can trade for a guy you could afford to sign, and UFDAs are not expensive.
2. The jaguars draft a guy in the second round. Four year contract. He turns out to be a terrific player. Should have gone in the first round, maybe a top ten pick. But he has a second round pick salary.
After two years, the Jags realize they will never afford him when he hits free agency. After two seasons, they trade him to the Patriots. Jags get a new draft pick so they get another player cheap for four years. The Patriots get a good player. Since they can afford his salary easily it does not run afoul of the rule of eight. They keep him for two years. Then, of course they can pay him what they want and can keep him forever.
3. (just thought of this) Rich owners lobby to allow trading cash for players. Rich teams like this because they have the cash. If there are teams that are truly cash poor, then the owners will vote in such a rule.
And I'm just a cap dope. Teams have smart lawyers working for them. There are so many ways to work around any brand-new, never tested rule when you have smart lawyers working for you.
One thing you can be sure of: there will be new rules made which we do not now, cannot now, envision. This will be a HUGE change, and the situation will not be stable until things shake out, a matter of years.
Rules which you now say are carved in granite will be done away with if it interferes with the money flow. The teams that don't have money will want some. The teams that have money want to spend it. The NFLPA will go with whichever way the players get more money.
No rule will survive the onslaught of the combined players, rich owners and poor owners.
It will be an exciting time.
ps And I still don't think the currect cap srules say you can move any money you didn't spend this year into a future cap year. I still think you are wrong on this one. I still think the only way to do it is with the type of tricky workaround that teams will be using for the rule of eight.
Is it true that the owners and NFLPA wrote in the cap rules that you cannot transfer money from one year to the next?