Opting out of his final year with the Brooklyn Nets might have been a big mistake for Andray Blatche. The offensively talented big man had the ability to remain in the Barclays Center for the 2014-15 season, though he’d have made only $1.4 million. Rather than pigeonhole himself onto the Nets roster, Blatche decided to opt out and become an unrestricted free agent, seeking out both a bigger payday and a longer deal that would bless him with the guarantee of financial security. …