If Nader is giving up on the US FDA why not stick

If Nader is giving up on the US FDA why not stick with the 28 day endpoint? If Canada or UK is really serious 28 vs 42 shouldn’t be a big issue. Let Nader put it to the test as soon as possible? The time saved is probably worth more than the p value loss / gain if these countries really want to approve separate from the U.S....