When Esbern was looking at the last panel of Alduin's wall, he said something curious. He referred to the heros of the previous games as "Akaviri". Specifically, he made a point to mention that... Why would he do that? It confuses me.

He didnt call the heros of the previous games akaviri.....

the onyl thing he called akaviri was the stonemanship, and the images of the blades on the wall who were kneeling behind the dragonborn.

You seemed to have misheard my friend.