...wut.
A Warband is not the size of a Loyalist chapter. Read the page you actually linked to...
Quote:
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Some are not whole Chapters but simply warbands composed of a few tens or hundreds of Astartes drawn from the same original source and led by a charismatic commander or Chaos Lord.
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tens or hundreds = 1,000 members of a Chapter-size unit
Quote:
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According to the current records of the Inquisition's Ordo Malleus, approximately 50 Loyalist Chapters or elements of Loyalist Chapters have turned Renegade in the ten millennia since the Horus Heresy.
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50 * 1000 = 50,000 maximum, if 50 whole chapters went rogue.
When you link to sources,make sure those sources don't actually contradict your claims next time.