So if getting MCs enemy poisoned to death by resentment potion lets him drain their corpse for power.
Doesn't that seem a lot easier than trying to fuck over MC? I mean his track record is quite bad against MC.
Yes and no, guide can absorb evil and resentment from anyone and anywhere, but for his bound to Liam the efficency is low, until Liam is lives he is unable to absorb like normal, that is the real reason he wants MC dead, and he doesn't want to wait a millenium.
We can see him absorbing evil to grow in power often, but he dislikes how little he is gaining compared to the amount, he gets a little more if it related to MC, but if is something on the other side of the galaxy and unrelated no matter how big it is he is just absorbing a fraction.
He would have been able to do it normally, but thanks to the interference of the dog spirit the plans failed at the climax, add how when he tries to help by infusing his power to incite the hate it makes the villain unable to think correctly and rush against MC, without care of their own self being, ending up with MC turning the table when cornered, they become drunk on power and blind to the possibility of loss, that opens them up to a counterattack.
Is the same in this case, had the pirate baron family organized in a long period of time to attack MC on multiple sides there could have been a chance to defeat MC, or damage his territory greatly, but guive pushes the attack to happen as fast as possible.
I think for his bound he can't even hop to another dimension anymore, that is funny and important because if he could just return to MC original world and wait some years Liam would die of old age, in the sci-fi dimension time flows faster than Earth.