[Den-O]

Kyoryugold isn't actually dead though since he's just been thought to be dead for 500 years. He's just imprisoned within Dogold but he'll be released or "revived" next week. He's living it's just that he's been trapped all this time. In fact he can't have been dead because they needed him in order for Dogold to Brave In with PteraidenOh.

Abarakiller died. Straight up died. He only returned later in Dekaranger Vs. Abaranger because the villains were trying to raise the strongest denizen of hell. They were trying to raise Dezmozoria from Abaranger but didn't realize that the truly most powerful spirit in hell was Abarekiller. He came back, kicked ass with Topgaler and then he returned to being a spirit after the crossover ended.

Burai died and returned as a ghost once in the finale to support the Zyurangers. And that was only because of a massive letter writing campaign by fans of the show to bring him back.

In summary. Yes. The last 2 dino themed 6th's died. And even Time Fire, who had an underlying dino theme and dino mech died. But I don't feel that means Kyoryugold will die. This show is far too light hearted for that, and we just had a gold die last season, Beet Buster