BestBidder25 is an alt of rouf553. I initially suspected that when he vouched for rouf553 on the thread where BitNinja got scammed. I posted my suspicion on his thread:
https://bitcointalk.org/index.php?topic=249325.msg2647857#msg2647857

He immediately locked the thread and deleted his vouch for rouf553 on the other thread confirming my suspicion.