This is incorrect. A senior tranche holder doesn't end up paying out if there is a credit event. The junior tranche holder pays IN since they are short CDS (equiv. to being long a junior tranche of mortgages, absorbing the first losses), normally they've paid in cash to begin with and were getting paid premiums + GIC income from the cash/asset deposit. As the credit losses mount eventually the senior positions pay on the CDS, into the CDO.
Why would a junior tranche survive losses compared to a senior tranche? That's impossible.
According to FRM text senior tranche often sells credit protection in balance sheet / non arbitrage related CDO transactions to Junior/Equity tranche in 90/10 CDO to produce above average cash flow and move credits off senior holders balance sheet.
Your definition makes more sense. Could be in the definition of equity tranche. I always imply equity as junior/extremely subordinated. Could have a different meaning in synthetic CDO.
FRM could be wrong, synthetic CDO's are a product I do nothing with.
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