@fmicablues7
I guess Konami, like you say, know how their games work so I would think the 'star' players of the time of each edition are highly accurate and maybe that's the crux of it, that's where their mark should be in relation to other players. So for instance taking FM Stats, let's say Roy Keane's short passing is 75 in PES6 (no idea what it was just plucking a figure out of thin air) and for the same year in FM it's 13. Then a 13 for passing in FM you could say should be a 75 for short passing in PES and so on. I remember Heskey being remarkably similar to the real player, even to falling over all the time. Again though, like you say, lots of errors in their stats so you'd have to use those star players to base it on as they will be the accurate one's.
The ideal way would be of course to know each player extremely well and work your own stats out (as Miguel has done for Porto and we could probably all do for our own teams, but none of us would be working to the same standard so while it would portray our team really well, they probably wouldn't be balanced when playing each other. So it's just not feasible for an option file full of teams so for me FM is 100% the way to go and always has been. It has a huge database, all players are measured the same and the majority of players are genuinely 'scouted'. Now of course we all have our own valid opinions on players that will differ but the key is the database is for the most part, as you say, the same standards, so the relation to other players will be consistent across the board.
I've evolved my formulas over time and I'm pretty happy with them now (although they can still improve of course and probably always will continue to evolve) I would love to see how the Amador file would translate into PES3/4/5 but unless someone makes a pes3/4/5 editor with an import csv then that isn't going to happen unfortunately, unless someone wants to manually type the stats in and that sadly isn't me!
On Amador, something I mentioned to Miguel, having seen how many fouls we're getting compared to the standard PES6 I'm really wondering now whether Konami didn't in fact 'reduce' the fouls from PES5 to 6 and onwards as such, but rather raised the threshold of what would cause a foul. Reducing some of those key stats such as balance has brought back many of the Pes 5 type fouls, knocking players over in challenges and so on.
I've also thought about using a site like whoscored which has a lot of the opta type stats. Particularly for long/short passing. I think it's fair to take the pes stat as a % being it's on a 1-100 scale. A prime example is Jordan Henderson who has something like a 91% pass accuracy but watch him closely and all he does is pass it sideways and back to his CB's 90% of the time. His short passing is 95% but check out his long passing stats and his completion % is 51%. So, as an example, could you use that and have his short passing at 95 but long passing at 51. The only problem is with a 95 for short passing would he suddenly become a danger around the box with great through balls which he can't do in real life? Personally I just wouldn't play him anyway but that's just me
Anyway it's something I've thought about because after all it is a 100% accurate stat for the current season and each player would be 100% accurate and relative to each other. It would be interesting to see how implementing those stats would play out on the pitch. I might try the passing stats for a couple of teams and try it out. It would be interesting if nothing else. Could use shot accuracy as well, shots to shots on target and so on. It's something I'm going to explore anyway
EDIT: Just looking at the pes stats explanation as well and I think that passing stat could work because it can be adjusted with the pass speed which is defined as the higher this value the more the player is able to make short passes that are difficult to intercept. So perhaps using 'key' passes which is also a stat on who scored that could be used to bring down the pass speed so in Henderson's case, his 95 would translate to good short passing in open situations but get in tight spots or looking for through balls and they wouldn't be precise and quick. Hmm, definitely going to give this a try now.