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Firstly, that is Alpha Halo, not Delta.
As for the explanation, Halo CE had limited renders and voices. I suppose so that you could get familiar with the marines. Anyway, SSgt Johnson played both the part of SSgt Johnson and any other sergeant that wasn't played by GySgt Stacker. So the guy hugging the Elite wouldn't have been Johnson. Chances are, most of the time you thought you were looking at Johnson, you weren't. The only times you can be sure it was Johnson in Halo 1 was when you meet him at the beginning of the second level, during the first cutscene in the first level, and during the cutscene where you first see the Flood.