RAW I would say they both have an individual cost of 0. The "while we stand" secondary talks about models, not units. If the models have no individual cost, they can't qualify for the secondary.
To make one or both eligible they'd have to provide a break down of how many points are attributable to each.
The knight special character, chronus and other models that spawn after the first model dies have their own rule about how to count them. This duo has nothing, and it's fundamentally different because they both start on the board anyway, it's not a kill one and the next spawns thing.
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