Of course, these are just some thoughts rattling around in my head, but here is what I've been considering:
you´re finally making sense except that the MC as it stands could take out Marcius with just being a baby so i doubt Marcius would be dismissive of him!
If anything yes Marcius was an ass to Sharon but he uses his resources wisely such as Astrid, and he had no qualms in asking the MC over and propose that they get to know each other!
wolf boys are aggressive but not dumb! his interest in Sharon also shows that he as brains, he sees a power he can not control himself but if he can thrall Sharon that power becomes his and adding to that Andrew day walker massive power it shows he is ambitious!
as for the way he treated Sharon we can assume Sharon in her relationship with Astrid was a sub so he was trying to portray himself as an Alpha, this way he can thrall her without making her a dumb slave i mean he needs/wants her power and that is somehow dependent on her wits as well as her eyes!
Furthermore marcius as somehow taken the MC under his wings, he ordered Sharon to save him, he could have sent Astrid... had he fully taken custody of the MC considering the kind of powers that attend his court i doubt he could have kept him a secret, do remember 3 powerful vampires possibly even stronger then him attended his court, Marcus Malia and that wierdo without a nose who was nice to Sharon ffs even Virgil shows up!
i just mean that Marcius did the best he could with what he had! had he kept him close it would draw attention perhaps from vamps he knows he can not really fend off! we saw how the nos handled his wolf boys, so he kept him hidden with a resourceful lackey that would not drain him off like Astrid could have done!
then there is the usage of Zephir... if he was really that dumb could he have "acquired" zephir and her powers?
yes Sharon dislikes Marcius but considering his position, i think he played it masterfully, i mean how could he have guessed that Sharon would be made an Archon when there is probably 200 stronger older vampires juggling for the position? actually there was no position to begin with, it was made available as a surprise for him and probably also to Virgil!