The "it's ekat's fault bianca died" is a dubious claim too. Because they encouraged bianca to kiss a boy? Yeah, I'm sure it was a huge orchestration to make Brandon jealous and get her murdered and not just a normal conversation... He's not some 6d chess puppeteer. ken is just gullible and believed every schizo lie she was told about Andrei by marky and Katelynn. Other people have vouched for andrei's character too describing him as a down to earth and helpful friend.