There’s no Apollo to Adonis for Creed 4 to kill off. Rocky has mentored Donnie from the beginning, but there’s no way they’d kill him off, and they’ve already used Rocky’s mortality to ...

In fact, Creed III has a higher Rotten Tomatoes score than Creed II (via Rotten Tomatoes). Therefore, there's no reason to think that the fourth film will be any less critically acclaimed.