Dushane wanted Donovan to go hide out at their grandmother's house in the country because, if you remember, Haze hit him with 20 kilos of food and at the time, Dushane didn't have anyone to sell it. Dushane wasn't confident that they would be able to move that weight before the deadline. Donovan was Sugar's collateral. That's why they really needed Jamie out the way. Once Sugar had Donovan killed, Dushane obviously wasn't gonna be dealing with him anymore and all bets were off. With the collateral out of the way and no way to sell the food, stumbling into meeting Lizzie and Lithe as plugs, taking out Sugar became the option for Dushane. And he used Donovan's gf to do that.
I think dude meant Jermaine, not Sully. Sully had no idea where Modie was, much less being able to set him up going to or coming from the eye doctor. Only Modie, Jermaine and Jamie knew that Modie was going to the eye doctor, and only Jermaine and Modie knew the eye doctor's address. Jermaine is the one that disappeared after Modie was killed. More than possible that he had Modie set up. Cops arrived too quickly to that location en masse. They had to be put onto his whereabouts by someone. Modie hadn't paid Jermaine for breaking him out and now, while acting way too unstable, had them hunting down Sully.
Jermaine is just a hustler/finesser, hands in different things. The reason he had that hit put on him was due to him screwing over some other dudes in a deal. The main hitman was trying to get out of that game, and into the music game, and outsourced it to Sully and Mike.
