NRL players trialling for NFL franchises might quickly become a thing of the past.Club bosses are keen to put a clause in the standard NRL player contract that prevents such actions and NRL CEO Todd Greenberg has backed them after the CEOs conference on Wednesday.The clubs have made it clear that they dont want their players going to another code, including NFL, and risking serious injury, Greenberg told News Corp Australia.That is a view the NRL shares, we dont support players going off to play with or promote other codes.They are contracted to play with the NRL and we do not believe they should try their hand at another code and expect to come back to rugby league if it doesnt work out.Any such clause would fall in line with ones in the current standard contract that prevents similar liaisons with rugby union or AFL clubs.We already have a clause in place prohibiting players going to play rugby union and AFL mid-contract and that will be extended to include NFL, Greenberg said.It is great to see NFL clubs recognising what great athletes are produced in the NRL.But at the end of the day, they are paid to play rugby league so we cannot let them risk injury and promote another code while they are registered with the NRL.The proposed NRL crackdown comes in the wake of North Queensland powerhouse Jason Taumalolo and Cronulla flyer Valentine Holmes recently trialling for NFL recruiters in Los Angeles. 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With a defense and special teams both ranked in the middle of the pack, its clear that the Dallas Cowboys hopes this season rest with an offense that is ranked first in Expected Points Added (EPA) per game and EPA per snap. But Dallas is nearing a crossroads at the games most important position. Should they continue to ride rookie sensation Dak Prescott, or lean on veteran Tony Romo?when he returns? Its not as simple as saying, The team has gone 5-1 so far, so lets stick with him. The Cowboys coaches are obviously in the best position to understand each QBs abilities, but it might be wise to add some numbers to the discussion.Prescott has only six starts under his belt, so we dont have a long track record to examine. Theres little doubt hes talented, but when players start out very hot, its very difficult to sustain that level of performance. Usually, many favorable factors have combined to allow such a strong start, and those factors are far from assured to persist. Its not a guarantee, just a strong tendency known as reversion to the mean.To examine this further, I grouped all new starting QBs since 2001 into five quintiles (equally sized groups) according to how well their entire offenses did in their first six starts. Then I compared those performances with how each quintiles offenses did in their next 10 starts. The idea is to look at offenses as a whole, rather than just how the QB himself performs, for two reasons. Dallas has a lot of good pieces around Prescott, and those pieces and his own abilities complement each other. And overall offensive performance is also the thing the Cowboys care about the most -- theyre not in a fantasy league, after all.Prescott is in good company in the top quintile, which includes guys such as?Tom Brady, Drew Brees, Philip Rivers, Ben Roethlisberger?and Cam Newton. But it also inncludes QBs who faded after hot starts, such as Tim Rattay, Aaron Brooks and Marc Bulger.dddddddddddd Trevor Siemian and Carson Wentz, two other notable newcomers to the league, would currently fall into the second-best group.Each of the five quintiles regresses to the mean in a different way, and Prescotts Cowboys would fall into the top quintile that holds on to much of its high level of performance through the next 10 starts. We can expect the Dallas offense to regress similarly, in the manner reflected in the graph below.Accounting for that regression, Prescotts Cowboys can expect to average about .09 EPA per snap, which would still be excellent, about sixth or seventh in the league. For context, over a typical game of about 67 plays, .09 EPA per snap would translate into about +4 net points above the league average (.03 EPA per snap is the league average so far in 2016). But how does this compare with what we would expect from Romo?The Cowboys offensive production during Romos career averages .07 EPA per snap, or about +3 net points per game above average, slightly less than what we might expect with Prescott. But in his last 32 starts, Dallas has performed slightly better, at .09 EPA per snap, or about +4 net points above average per game.There are many considerations we havent accounted for, such as Romos age and associated injury concerns, Dez Bryants absence or presence, or opponent strength. But by seeing how top offenses tend to perform after hot starts under new QBs, we can get a rough approximation of what to expect through the rest of the regular season. The results of this exercise show that, analytically speaking, the Cowboys can feel justified going with either quarterback. ' ' '