I got 6 rbs on my team. Who should I keep?

Unfortunately, Richardson has almost no value, Bell isn't that great, Brown is coming off injury and a question mark and Vereen is the same as Brown. Really, no team is going to take 3 of those guys off you in exchange for a stud unless their team is really really depleted. I mean, if they have 1 good RB (kind of rare), they might take the risk and deal him for 3, but you'd be lucky. You can offer Richardson, Brown/Vereen and Bell for a top back, but I doubt they'd take it unless they only had the one good back. Also doesn't help that Richardson is basically someone you should drop.

Anyway, I'd try keeping Vereen.

Edit: Lucky you if there's a guy in that situation. Throw him any 3 of your RBs and get McCoy. If you have McCoy, Bush, AP all stay healthy all season then you're set.

Leave it as it is. Le'Veon Bell is a perfectly good fantasy player to have as your backup. An every-down back in a run-first offense is in line to be starting, let alone on your bench.

You'd be much better served looking to trade some of your backs for upgrades at other positions, like WR or TE.

Why does it matter? If you can actually trade 3 of them for a top back, why are you worried about who your 4th back is going to be?

Just see if you can actually get a top back for any combination, and make the deal.

you keep bell but i'm afraid the other there wont be much value