I don't think they are that close yet. Yes, the owners are at 5 years of data, but they were there a week ago or more. There is no single authoritative account that I have seen yet of exactly what the owners offered, but its is clear that it lays somewhere between profit numbers for each franchise (their previous offer) and the complete audited financial statements. PFT threw up its hands this week and said it was hard to nail down the disconnect beyond the time frame.
Their current offer seems to be audited figures used to calculate the profit numbers. Since its selective, any third party (I have trouble seeing the players objecting to blind numbers if they can agree on a firm and then hand those numbers to their own accountants) would have trouble doing anything other than verifying the math.