Well, it's not pretty conclusive to me. We won't anything conclusive to such overzealous statements until about 5 years from now. Until then, it's anyone's guess (wanted to put that in bold since you are having some trouble realizing that is what you are doing). Also, a lot of your facts (a word you should look up sometime) are debatable. For one, I hardly think Lethonen's ceiling isn't any higher than Fleury's. Lethonen's further along his development....well I would hope so, he was drafted a year earlier. And like I said at least twice in one of these threads, just because a player is better now doesn't mean he stays the way, especially when we are talking about 20/21 year olds, and even if Lethonen is 'progressing as expected.' Also, the idea that Lethonen may start for Atlanta while Fleury won't for Pittsburgh is pointless....so what? Atlanta is a better team, and Lethonen is a year further along. It seems reasonable to me that he'll start beforehand...if he does, it's highly likely Fleury will follow soon after. None of this has much longevity in my eyes, not for what you are trying to do with it.
If you want to say you think Lethonen is better and think he will be better than Fleury is fine...but you are trying to tell me that he WILL be better, which is ridiculous. They have proven very little in the NHL (the league that matters) and when they do keep their foots in the door, both will likely be playing for roughly 15-19 more years. To guarentee that one will not only be better than the other, but 'by far', is a ridiculous, ignorant statement. You cannot make a statement such as yours sound credible. There is just no way.