Very interesting discussions here, it's a joy to read.
About the aggression stat, your conversation reminds me of something I meant to say here a few days ago: the effect of high Aggression on...keepers. Yes, naturally the vast majority of them have very low values on this setting but there's a few rule-breakers like Porto's
Vitor Baía. On my PES5 ML I've recently played against a team with such a keeper, can't remember who it was. Interestingly, that CPU-controlled individual started doing things I don't think I've ever seen any do on retro-PES games. On a few occasions, his team was building up play from the back using the CBs. He comes a bit forward and is passed the ball, the CBs widen, and he dribbles it forward quite a bit until he's far away from his own box. I then apply pressure and of course, he passes it. A Libero Goalkeeper before it was cool! I wonder whether high Aggression on keepers may have something to do with how eccentric they are; a low AGG keeper must be more offensively conservative.
About defenders coming up for corners/free kicks, before the ball goes out/after the foul is called, I use the L2+R1 combo to raise the team's mentality to the highest setting (red) and at least the tallest CB always goes up, as well as sometimes a tall DMF. Sometimes even sidebacks; I've been playing Espimas as a RB and he always goes up. I don't know what is the criteria here, if it's the players' height or Header Accuracy (or both?), but I suspect it is the former...
Plus, say you've raised the team's attacking mentality before a corner; even those defenders will not be on the box right away; if you pull the camera away from the box you'll see them slowly arriving...that's why I don't even bother setting the free/corner kick takers anymore; I know I'll manually have to switch it in real time if I don't want to wait for those defenders to get to the box - because if you switch it, they'll already be there as you guys mentioned.
Regarding the "secret" behind fouls on Amador,
@mattmid already "pulled the veil" and though I agree with what he said, we could go even further: all of the lower stats create the opportunity for more fouls. Then, of course, low balance is key. Lower stats make the game more chaotic, unpredictable and much slower paced. Then, inevitably, you'll have more physical contacts, more fouls. This is why modern PES and FIFA struggle on this area, by the way. The other day I caught a bit of some eFootball competition (FIFA) and the real players were so skilled, as well as the virtual ones too, that even if you wanted to commit a foul you wouldn't be able to, because not only everything happens at such a high pace, the players can always skillfully evade opponents. Then the game becomes a kind of Football Harlem Globetrotters spectacle where each player when he has the ball does something cutesy before passing it to the next who'll do another cutesy bit and there you have it, a sterile battle which looks nothing like actual football.
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EDIT: On a completely unrelated matter, playing Zamenhof up front allowed me to hear the Spanish commentator say his name for the first time ever - was it after PES2 that the commentators no longer said the names of keepers? -; apparently, he thinks Zamenhof is..."Zamunkov". Poor guy, can't get a break can he? Not even his name is pronounced correctly...