I'm probably wrong but I don't remember Onslaught being that...blue...
It's odd but it seems to be the one combiner that TakaraTomy have made less screen or toy accurate with the colours being wrong on three of them. They usually put so much effort into theirs that it blows the Hasbro versions out of the water, but the colours on the Hasbro Combaticons look better. I hope a Hasbro release of Blast Off has the colours of their jet Blast Off.
TF Yuki pimpin' the wares:
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Via TF Yuki:
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