It seems that the game is programmed to get him out of the way by driving randomly.
Yes, they often turn characters that are no longer needed into normal peds. If you didn't follow them, they would eventually just be deleted by the streamer like any normal ped.
he's not too worried sending Carl to Glen Park alone. But maybe Sweet knows that the Ballas in Glen Park are poorly armed.
Nah, he just has faith in Carl. Carl's arguably the more skilled of the two, while Sweet is simply the more dedicated (and naive) one.
"That's my brother! Get a car, we'll meet you out front"
- Sweet's Girl, after CJ saves his ass
That doesn't excuse the fact he couldn't protect his girlfriend from barely a handful of gangsters. You'd think he'd be strapped all the time,
He was (otherwise they'd have killed him straight away), but the idea was that he was in a compromised position. He was outnumbered and had nowhere to go and no way to gain the upper-hand. He was able to protect himself and his girl (though I'm sure he'd offer her as bait if it went too wrong
) from cover, but eventually they could have managed to get to him.
"Yo dick getting you in trouble again Sweet!"
- CJ, lecturing his older brother for not being careful.
Add that to the fact that there's obviously something fishy going on with Ryder and Big Smoke... So obvious you'd think either Sweet, CJ, or someone would have figured it out...
Obviously? It was actually quite a well-kept surprise to me when I first played... Smoke seemed less committed and Ryder seemed like an asshole (but genuinely interested in helping Grove Street - to the point of breaking into an army base to steal weapons) but the betrayal seemed too big for them - which was true, they were pretty much just pawns in the operation. No one had any clear reason to suspect anything of them, even though their differences in opinion seemed to frequently be resulting in arguments. Plus, I think their minds were a bit preoccupied with their dead mother, pressure from CRASH and trying to restore Grove's power. Smoke managed to put on a pretty convincing act that he was as shocked about their mothers death as they were. They were going for Sweet, also, so if they were successful it would have basically meant the end of Grove Street - and CJ would have still been in Liberty (unless Kendl or, well, his mother called him, which is pretty likely).
The biggest plot hole I can think of is how Smoke and Ryder weren't brave enough to finish the job themselves. If they'd spent less time playing domino and more time focused on the plan, they wouldn't have ended up dead themselves