I disagree that Tidus would have said something even remotely similar to that speech in that situation. That was Yuna making an informed decision possessing all the facts. I think it's pretty silly to say "well Tidus changed Yuna so she gets no credit for anything she says or does because of it." Every darn moment I gave you in that writeup was Yuna. If we want to detract from someone"s accomplishments because someone else influenced them, then nobody has ever truly accomplished anything.
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"I couldn't stand a day without a past or future. I need to live each moment to keep fighting here and now."