Seems like it to me.

-His season is the final one(due to a stupid cancellation) and he stars in the final story arc(discounting the finale which also stars beastboy along with terra).

-He's the second most important character in Terra's season.

-He's also the second most important character in raven's season.

-Second most important dude in cyborg's season.

-Costars with terra in the season finale.