Lennox would only survive for months or years cause he's lucky enough, probably be resourceful but after months of isolation would make him go insane and maybe become too reckless and die.
Yusrif should not be allowed in a zombie apocalypse situation, it's his dream to bait people to be zombie food while he escapes and runs, bro is the definition of an evil child, "oh that person is getting eaten by a zombie and needs help" "let's take their supplies while the zombie is distracted and runs away". Hell survive as long as he doesn't get outsmarted or tricked.
Cecelia and Luke wouldn't survive for a moment, chased by zombies, starvation and exhaustion would be the death of them.