You make some points Ryan that are clearly what alot of fans think, however I dont think the episode was meant to be so cut and dry.
The reason why we didnt go into all the detail with Lana finding out about the secret is because that is going to be done at a later date when she does find out for real and gets to keep it. That teaser was just that a teaser into what the basics would be if Clark told Lana his secret.
I thought the gasp and the look that Lex gave after seeing Clark fly by was perfect. At first when Lex came out of the car it was all about Lana, then bang he sees Clark and that is all he is interested in. That look will now set up the plot for the Lexana. He may have feelings for Lana, but its all about Clark.
And as for the sacrificing his Dad for Lana, well that is such a lengthy conversation that has so many aspects to it, that I wouldnt even try to discuss it here.
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Interesting tallying of these episodes.