It's way too early to be comparing Trout to players that have finished their careers and this constant running out of WAR to make a point is getting old. WAR isn't the only barometer of a players greatness, it's just one stat, and that one stat isn't the end all of be all. People use WAR like it's the gospel and the final word to any argument about what player is better.
I think Trout is a great player, maybe the best in the game today, but his career is unfinished as of this moment. Trouts numbers pale in comparison to Juniors and Mantle's etc. because he hasn't completed his career. A lot of things can happen along the way just look at Prince Fielder. ymmv