I agree, but his antagonism will not go very far, Zach isn't the smartest guy around and the only way he could make MC's life more difficult would be with Ethan's guidance, but Ethan would not be around often to properly guide him and then Zach would probably screw up things and make the wrong move while sinking the whole plan, Ethan would lose his patience and throw him away at some point as Zach is 100% disposable (Zach would probably run back to MC asking for forgiveness). But if Ethan somehow takes Daryl to his side to make the "asshole trio", then this could pose some danger to MC as he would attack on the Erynn front (himself), MC's popularity, credibility and social life (Zach, Daryl and his crew) - with Daryl guiding Zach and on sports if Ethan does something (legal or not) to improve Daryl's performance on competitions and/or sabotage MC.
And i think Daryl has even more "reasons" to want to sabotage or go against MC than Zach, depending on the path, MC can fuck his girlfriend, throw her away with her wanting more, get popular with the ladies, beat him on the competition taking his spot light and then take the new girl he got a crush on (Valeria).
On this front theres two things i cant wait to see:
1- MC "snitching" to Valeria everything Zach did.
2- Daryl seeing MC and Valeria togheter.
And if this (2) could happen in front of Tori, even better, i can totally see her laughing at him, making jokes and saying that Val is in for a treat as MC is good with sex and Daryl realizing MC fucked Tori, something tells me Daryl would be "a bit" pissed