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I think they wore black armour already and the only change made after their reunion with Ferrus was painting their gauntlets silver. Ferrus was one of the earliest primarchs to be rediscovered (the third, after Horus and Russ, IIRC), so the Tenth Legion wasn't the Storm Walkers for very long anyway. I also just can't imagine Ferrus would bother having his men completely change their livery to honour him - he strikes me as being both too pragmatic/businesslike and too humble. He's noted as not even being comfortable with them painting their gauntlets and embracing bionics to honour him.
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