You didn't say they were from IFAB but as the rulemakers it's they that decide on any changes to the rules of the game. If you're saying you done them off the cuff on your coaching course it's even less believable. You'd have thought coaching courses would have concentrated on coaching, not trialling changes to rules.When did i say our trials for an offside rule were from IFAB? I think you've imagined that part. We did them at Middlesbrough academy.
Of course age has a bearing, how does a 22 year redefine a position when legends like Lahm or Zanetti would be picked before him?
I'm not sure I understand your last sentence. Whether x or y are better fullbacks than Trent, how does that change the fact that Trent is playing the role in a way we've not seen before? Football evolves and we see different systems and ways certain positions are played. It doesn't mean they're better or worse. It's like different fashions in different eras. 30 years ago a fullback was an out and out defender, we've seen that change over time with Trent the latest player to take it to another level. That's not to say that in 20 years time it won't have reverted back to a more conservative style.