Visualizing LeBron James leaving the Los Angeles Lakers to join the Warriors requires tuning out financial implications, a hyperactive imagination and prolonged suspension of disbelief. Too many reasons why it can’t happen. Won’t happen. Shouldn’t happen.But rumors of a potential Warriors-LeBron union won’t die, and one of the reasons it lives is that none of the principal figures is going on the record to kill it.And some are saying off the record that it cannot be dismissed.“I know it seems crazy,” one well-connected league source told NBC Sports Bay Area on Wednesday. “But there is at least curiosity on both sides. This wouldn’t even be a conversation five or six years ago, and it might not happen now, but there’s enough there that we shouldn’t ignore the possibility. It’s mostly up to LeBron.”The general belief is that James likely will remain in Los Angeles, where he can continue to play alongside his son, Bronny, and stay close to his family. The Lakers can offer a considerably larger contract than Golden State, which tops out at the non-taxpayer midlevel exception of about $15 million.Many other...