Not everyone thinks like you do...
Edit: removed double point.
So this leaves two possibilities, I
think. One, Noumi had some other finisher move at level 1, and later chose DC as his level bonus. Two, DC was always a level up bonus that appeared from level 2 onwards.
The feasibility of Noumi gathering enough points to level up is another question. Unless his brother was kind enough to give him the tutorial, Noumi had to learn duelling the hard and painful way. Plus, he saw BB as this:
Quote:
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“...The first thing that that guy gave to me...it was of course «Brain Burst». I was foolishly glad and even excited. That‟s why, just as his first lecture finished, I felt disappointed when he said „Earn ten points every week‟.
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So if Noumi lost BB due to inadequacy, he'd lose the only thing Yuuichi has ever given back to him. Desperation, not lust for power, was Noumi's drive to fight in the beginning.