A little misunderstanding here over what constitutes an "Alpha" in a primate social group.
Marcus is not in fact an "Alpha Male" - though he tries very hard to be.
The person who behaves in a true Alpha fashion is actually Mr Lisa, She does little, just sits in her throne (no-one else takes her "centre seat" at the Bus Stop) while her troupe fuss around her, coming and going, delivering up gossip and ciggies, and she only stirs herself for the task of roaring out defence and defiance when required.
Marcus on the other hand, constantly needs to chivvy and coax and brainwash his troupe into keeping online; he WANTS to be Alpha, but he is in fact more suited to a "Beta" role of enforcer.
Significantly, the BB House's "Alpha" female will not partner the wannabe Alpha Male, and is sniffing around both Tom & Siavash in hopes of finding a better candidate.
As with most BB shows, there is simply no-one there with the characteristics of a true Alpha.
For anyone who has a real interest in such thing, you should check out Jane Goodall's primate studies in Gombe, particularly with reference to the power struggle between "Freud" & "Frodo" (Marcus is "Frodo")
Useless but interesting titbit: Frodo the chimpanzee is famous for murdering a human.
Quote : "Add to that his 1993 Golds Gym 'body builder' gear exposing his pumped biceps"
"Golds Gym 'body builder' gear"?
I just thought it was called a "Wife-Beater Vest"...
Oh, and Marcus doesn't chew, apparently... just rips off lumps and swallows them whole like a crocodile, no doubt!