He took two entirely different positions.

No, he didn't.

You want to claim one was his real position and the other was a "soundbite" just for show. Someone could just as easily claim the reverse.

He had already said he would accept the results of the election, in a discussion with reporters.

It is apparent to anyone that can think critically that his dramatic "I'll accept the results... IF I WIN!" was a soundbite clip intended to capture the attention of the media, show confidence, and so on.

If he'd been a responsible adult with even the slightest bit of respect for the institution of democracy in this country, he'd never have made any sort of remark about not accepting the results of the election.

There are plenty of reasons to not accept the results of an election. Yet you say he is a child for making a remark, which he didn't, in fact, about not accepting the results of this election.

His soundbite comment implied it, but that was the point. Show confidence, grab attention, distract, it is what won him the white house.