
Tf??!!! It is now 2025 and the prejudice to the point of sexism is still present?? You shame Chase of him being the strong in masculine aura when you do not think of Josh is being way too strong when he is an omega? your logic is flawed.
Have you ever realize that in this universe, alpha beta and omega are secondary traits thus the way someone built before their manifestation will not change a person's whole bodily anatomy.
Spoilers ahead:
Josh was supposed to be a football player and he set up himself to be a professional, so he really naturally a strong individual when suddenly he had manifested as an omega and in this universe, having secondary traits is rare and alphas and omegas are not allowed to play professionally.. does him being omega made him a weak dude?? hell no!!
Same with Chase. Do you expect a child actor to be buff when he has his whole life is revolved around acting?? Ofc he is not a strong as Josh due to him in his childhood years to be into sports and be a player to be strong.

Because he doesn't care, he could train or could use substances, the later would be ok in his case since domiant alphas can eat most drugs like candy without having an negative effect on them.
In the novel he was described as thin, having less muscle mass than Josh, while being surprisingly strong when he for example grabbed Josh.
Spoiler from DMIYC
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When Josh and Dane talked about how strong the Millers are, Josh said they are no joke, because he started to train Chase in selfdefense and started having problems fighting him.
So Chase is able to significantly improve.
Most likely he will never be as monstrously strong as Grayson, but he certainly can be very strong.

Chase is physically stronger than Josh, even when he has less muscle mass than Josh. Josh was several times surprise how strong Chase really is when he grabbed him.
Where did you get that he is weaker than Josh? I'm not saying that Josh is weak, because he is not.
Probably in Josh's head? Josh even underestimates Grayson in KMIYC, and that one is really much stronger than Chase ( most likely even if trained) if he is serious, probably because he let him hit him before? Possibe.
The problem with Chase is his lack of motivation and his lack of training ( fighting skill, building muscles), when not trauma or his issues with omega pheromones kicks in.
Why someone like him, an Alpha is so weak??, They're supposed to be strong and stand above all right??