First of all I would just like to say hi. I think a motif can be considered a motif without it being restated. For a motif to be considered to have any sort of leitmotivic indentification it would need to be restated and reshaped but other than that there are too many other abstract thoughts, ideas, emotions, etc. that the single use of a motif can represent that never need to be expressed again in a piece of music or art after it's initial use but that does not take anything away from the motif being able to stand alone and represent itself there and only then.