I saw Avenged sevenfold at their first tour after The Rev's passing and they dedicated So far away to him (even the whole video of the song is about him) but that's a song of the record that they were promoting at the time.
Now Matt dedicate the song to Jimmy when they play it (only a few shows, its a rotating song) but the rest of the show is not about him, even when they were playing songs of the Nightmare album where almost the whole record is a tribute to him.
My point is that everything is not about Chester, is a critical part of the band even now? Of course but people move on, they have to. ACDC is still there without Bon, Alice in chains without Laney and Metallica without Cliff.