There is nothing "credible" or "legitimate" about a 28 game schedule.
The concept is ludicrous.
Who do you play in a 28-game schedule? Which team don't you face?
Or, assuming no cross-conference games - then you have, what? Two games against each team in your conference?
There isn't an asterix big enough to put next to the "Stanley Cup Champion" of a 28-game season.