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Finally, while looking into this I found this bug https://github.com/bitpay/bitcore-lib/issues/94 which could conceivably have affected the wallet your friend used. So that's an extra twist on it.
However wallets can differ in which derivation path they use to create addresses from the seed. BIP32 explains what that is. There are a few common ones but also lots of special cases; check out https://walletsrecovery.org/. Definitely urge to if at all possible figure out what the wallet was (if Android I think there is a way to check history of apps installed via the store, not sure but maybe something similar is available for IOS).