Ok dude, you're being really dense now.
"You can only truly wow a player the first time he sees [a cutscene]"
Just like with any movie, you can really only fully enjoy it the first time you see it. What is the problem is this?
"
I felt if players saw the cutscenes outside of the game, they would no longer serve as rewards for playing the game"
Thus if you can just watch them on youtube, you don't need to actually play the game anymore to enjoy them, thus making them no longer a "reward" for playing (i.e. no longer an incentive to buy the game). There is absolutely nothing there about "internet ruining mah surprises", it's "internet letting people watch mah cutscenes without playing mah game". If Sakurai actually complained elsewhere about people finding out the secret characters and such before playing the game, then link me to where he said it, he did not say anything alluding to such when he lamented about the cutscenes.
And you do realise the cutscenes took up nearly half of Brawl's disc space? And all of them together were nearly an hour of time? They absolutely were a significant development and space drain, Sakurai even said in the linked quote how they worked hard on them. There is no "huge leaps of assumption", that is the reality of the cutscenes. And since they were something you could fully enjoy on youtube without playing the game, they were ultimately a waste of significant resources, which Sakurai realised and thus is why Smash 4 will be without cutscenes.
Your other "points" are being ignored because they aren't relevant to your claims of Sakurai "hating spoilers". Yes Sakurai loves putting in secrets, but he has never once complained about people finding the secrets out before playing the game. Your Dojo example even goes against your claim; if Sakurai was completely anal about secrets being kept secret and absolutely didn't want anybody finding them out before playing the game, then he himself would have never given people the option to see the secret characters on the Dojo so soon after release to begin with; he put Ness up the day immediately after the Japanese release (which was also a month before the US release, and he would put up six more secret characters before the US release), and put the final secret character, Wolf, up exactly two months after the Japanese release (which was nearly two months before the PAL releases). That's completely counter-intuitive for a guy absolutely not wanting any secrets to get out under any circumstances to do, someone like that would never willingly give the majority of the playerbase an option to see the secrets before getting to play the game.
So if you and others can stop going around spouting "Sakurai hates spoilers, he won't put in secret characters this time!", it would be nice, as there is no absolutely basis to that claim, and everythng there is against it.
Also, apologies to the K. Rool thread about this, as it isn't really relevant to the thread (though if K. Rool is in, he'll probably be a secret unlockable, which will definitely return, thus this would be somewhat relevant as it would show that he shouldn't be expected to be revealed before release
)