LogFAQs > #905561402

Paladin likes buffs. It's better to make two bodies for a buff to potentially stick to than to make one slightly bigger thing.

Also, the Paladin hero power makes Silver Hand Recruits. Those are 1/1, and they had already made cards that care specifically about Silver Hand Recruits when they made Justicar, so it wouldn't be consistent to make a 2/2 Silver Hand Recruit or a new thing that isn't a Recruit. At the time, the synergy of the bodies with Quartermaster and Warhorse Trainer was part of the point.

Turns out when you don't have to draw and play a 6 drop to get the hero power, it's really good.
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DPOblivion was far more determined than me.