In my humble and nowhere near professional opinion, the simple answer to that is yes.
Ward is not only the undisputed and undefeated super MW champion of the world, but he also has an Olympic gold medal he won in the 2004 Athens games to back up the claims of him being the best pure boxer in the sport (sorry, Floyd). And to add to his accolades according to his trainer, Virgil Hunter, he hasn't lost a single fight since the young age of 12! INSANE.
With a victory over LHW champion Chad Dawson, who is coming off a dominating win over the legendary Executioner ( a win that many believe to be the only true decisive loss in Hopkin's historic carrier), Ward will prove himself top dog not only in his division where he ran over guys like Froch (a fight he dominated with a broken hand), Kessler, Abraham, and Green but also unofficially in the LHW division as well, as he would have beaten the champion in a higher weight class that beat guys like Hopkins, Tarver, and Adamek (who later on went to challenge Vitali for a HW title).
Ward's dominance is even more highlighted by the fact that he makes dominating top ranked world class fighters seem so easy. He makes it look like he is 2-3 notches above the rest of the competition.
What do you all think? Most sites already have Ward within the top 5 and with Manny's recent and apparent decline and with Floyd only fighting every so often, and not looking as dominating as he once did (see his most recent Cotto fight), does Ward have a legitimate claim to be known as the world's best boxer with a win over Dawson?