I think Adam lacks the ego to really succeed. He needs a bit of Ibrahamovic DNA in him. He's played ok, but no actual end product. As you say couldn't he be better than that? I remember at Saints I got frustrated at times when rather than making something happen he gave it to a less able player.
I agree, perfection is a bad word for this, but it was the best I could come up with at that moment without losing my thread. How about performance ceiling.? We'll see how your two laws stand up.
It took him that amount of time to score. You're ignoring his approach play and his part in a team that were creating good chances, that weren't taken, as against England's inability to break Wales down by their own expertise. I'd sooner have Payet than Lallana, if the option was there.
Sterling should have scored after five minutes. The only really good chances are the ones which end up in the net.