Thanks for weighing in on mine .. although since we're both asking about Charles not sure how much help I'll be!
That said, I would maybe roll the dice and start Tolbert if you have him, I think he's bound to find the endzone at least once against Sea. I have MSW too, and am always scared to start him; one game he'll come through big, and the next he'll lay an egg.
I dont like MSW against any team with a good corner, which philly has. As its ppr, I'm not sure how good an option Maclin is. I like tolbert, he should get 15-20 carries and get into the endzone. charles is iffy, until the chiefs figure out that he's the better option at RB, then i'd say he's a flex option.
That said, Tolbert looks like the best option of the 4.