DD in his own words : can't take another blow like that – gotta make my move now, when he least expects it.
So you really think that an already exhausted DD can surprise a much faster opponent with an inbuilt alarm system ? Well, theoretically it’s possible I guess...
And it was a clean victory for Spider-Man, because he could have knocked DD's head off if he wanted (DD can roll all he wants, but Spider-Man cracked Hulks ribs once, and I don't think DD's jaw is stronger than the bones of Hulk).
And what was holding Spider-Man to finish him while DD was on the ground for a few seconds ? Nothing.