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Breakup could also be from gravitational tidal forces , ie a close approach to one of the other planets... ? Not just from collisions...
Another thought... also gravity based, if the asteroids are very irregular in shape then they're susceptible to tidal-locking effects when they pass by other objects... over a long period, and regular close approaches to other large objects the rotation period might change? Just a random thought...
cheers, Bird
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