In that particular instance of we having same wallet address, it was of no coincidence. I was ignorant of the fact that it could pose some trouble so, I gave him my wallet address to apply and collect payment in that particular instant due to the fact that, I had mine set-up by the one who introduced us and he was yet to set-up his and that was it.
Ok, let's say for the sake of the argument that you just wanted to help your buddy so gave him your wallet address, but what about twitter account
https://twitter.com/Randicrypto that both you and Coinpreneur used? This time he is helping you, giving you his account because somewhere along the line yours got banned?
And here is you using the same Twitter account, year later.
Thing is, stuff like that could happen, and it could have been just a case of buddies helping each other with addresses and Twitter accounts, but exactly the same excuses have been used by numerous bounty campaign cheaters, so no one will ever believe you. Tough luck.