No. 100% guarantee that someone is alive because of the post credits bit. The 'old man' mentioned is also quite likely alive. (Burt and Angel perhaps?)
Kalani is extremely uber unlikely to be alive, but there is always possibilities.
There is no mention at all of Saul, Lizzy and Victor dying, and in my mind they all ran off together and escaped.
Lewis was probably still locked up.
As for everyone else, they were in the parking garage when zombies got in. Riley got out followed by zombies so unlikely to be survivors down there.
Mr Whiskers could be anywhere.
Oh, and Scratch, Tar, Bricks, Durai and Skittles are still all good.
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