He's literally saying what is best FOR THE TEAM, is maybe not a genuine competitor, not what is best for him, but what is best for the team.
Hamilton has been nothing but fair in his driving against Alonso, Button and Rosberg. The same can't be said for two of them, even the Canada crash between Hamilton and Button, Button took full responsibility for, though it wasn't at all a deliberate act like Rosberg/Alonso have done.
Hamilton didn't hold someone up in the garage, he didn't make a huge deal in a race and swing over to the race wall while demanding on the radio he be let by his competition, he didn't hit any of his team mates(or anyone else) deliberately.
Hamilton is a fair competitor, not all top drivers are fair competitors. All the problems within the team were created solely by Rosberg's actions and as such the team would have less problems without someone who might start doing naughty things if they aren't winning.
Hamilton has since day one in F1 been happy to drive against anyone. Many many drivers make a stink and tell their teams to not sign say former F1 champs, Hamilton had zero issue with Button being signed. He's never had no.1 status, there has never been a single hint of no.1 status at any stage of his F1 career, Heikki even competed with him a couple times but in general had no where near the pace to be anything but no.2 by default, not contractually.
Hamilton is honestly one of the few drivers in history who has been this fair and never cared who he raced against so making the accusation is utterly stupid.