After all, it’s more than possible that Oliver thinks a certain character is dead in the premiere only for that person to be alive in some future episode shocker, with a non-Oliver flashback showing how he or she survived the explosion on Lian Yu.
It’s not known whether all the answers regarding the explosive showdown will come in the premiere episode of Season 6, or if some facts will perhaps get stretched throughout the whole season.
There’s also the possibility that viewers will only see Oliver’s account of the events from that episode, since Stephen Amell also hinted that elsewhere in Season 6, we’ll see flashbacks focusing on other characters.