For a dominant alpha he’s so useless

If depends on when they present, Chase presented late, so he is more normal like Keith. Although he has some issues concerning violence. But it also depends on how they handle pheromone release, Chase's father for example lost his ablitiy to feel emotions because of pheromone accumulation, aside for his partner.

With Chase there are two problems: he has no motivation to train himself, made himself dependent on others and he has dog trauma /problems with omega pheromones.
And at the moment there is also the problem with the medicine he took before they left the hospital.
If Chase would make his body stronger ( he is thin and has less muscle mass than Josh; the manhwa got his build wrong) and would train selfdefense, it would be different, he is actually much stonger than Josh.