Chris Johnson has sucked against average defenses. I would trade him in a second or play someone else over him that shows a sliver of scoring modest points. Also, Fitz is the QB in Tennessee.
Give me Randle against the Eagles D over Johnson against the 49ers D.
I can see your argument, but I think too many people are buying into Randle just because he has the opportunity this week. I'd play him over most non-starting backs in the league for this week, but I'm not impressed by what he did last week: 11 carries for 17 yards against the Redskins. He might improve, but I would be more comfortable if he were a more seasoned running back with proven talent.
Chris Johnson isn't an inspiring rusher anymore, but he still has some speed and can break off a long run or two on any given Sunday. Greene probably won't be cutting into his workload much just yet, so this might actually be a good week to start him. In PPR he wasn't even that terrible against Seattle last week considering all the alternatives. I'd take 8 points for an RB2 when there aren't a whole lot of options this season. Chris Johnson isn't 2k anymore, but he has still put up at least 1,000 yards rushing every season since 2008. The past three weeks he's faced the Jets, Kansas City, and Seattle. Not exactly average teams
defensively overall.
Kansas City and Seattle are better at defending against the pass and not as good against the run as the Jets, but there's an argument to be made that really good defenses can selectively shut down the run when they feel they don't necessarily have to go after a QB as hard when a team has, say, someone like Fitzpatrick and not a lot of good receiving options. Philadelphia, meanwhile, is a bad defense overall (one of the worst), but is right in the middle against the run but is one of the worst against passing. The Cowboys have a good QB in Romo (whether you like him or not), and receivers like Dez Bryant, Jason Witten, and even Terrance Williams who could collectively get a lot of yards and a few TDs. They may not have to run that heavily.
It's not really a good option either way, but I would rather drop Randle to get someone like Allen to play at WR or Flex, since he is clearly the best receiving option a heavy passing team like San Diego has, and they've been using him the past couple weeks. I'm really surprised he isn't owned in every league yet. Everyone got excited about Randle because at first it seemed like Murray would be out a couple of weeks, but for a single week I'm surprised by how many people used huge amounts of FAAB budget or a high waiver priority to pick him up.