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Let's see if I understood this correctly: once the network splits into BTC (with SegWit) and BCC (without SegWit), if someone spends an old BTC coin (where old = from before the split) using SegWit, anyone can "steal" that same coin on the BCC "mirror universe"? Sounds worse than merely replaying a transaction from one chain into the other. That's so going to be a mess.

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Correct, though this isn't really anything special about SegWit. If BCC had forked right before Bitcoin added P2SH for example, the same would have resulted from P2SH transactions.

Actually, since BCC is a hardfork, they can make the Bitcoin Cash spending rules whatever they want. They could have made SegWit transactions totally unspendable if they wanted. They could have made all Bitcoin Cash corresponding to the Bitcoins sent to Blockstream spendable by anyone, etc.

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