Or if you want I could make it for you. (Just PM me !)
It matters how it is generated. If he give out just private key, then yes it is not recommended. But if he mine with specific public key then he generate just private key part which is only usefull to the owner of the public key. For more info I recomnend to read:
Vanitygen: Vanity bitcoin address generator/miner [v0.22]
https://bitcointalksearch.org/topic/vanitygen-vanity-bitcoin-address-generatorminer-v022-25804