I think you may have misunderstood me or I didnt put it clearly enough, I'm not saying that FM are wimps, I'm saying that red devils are more aggressive. I have never seen a 'wimpy' RD, but like I said before each fish has a different personality. I'm sure there are FM that are more aggressive than other fish, but I'm saying generally red devils will be more aggressive.
Thats why I said 'FM are quite peaceful for cichlids'. They can work in community tanks, I personally have done it years ago, but I wouldnt even think about putting a red devil in with say average community fish eg. swordtails. Agreed they can hold their own, but when you compare them to other CA cichlids, on a whole I just dont think they are as aggressive as some of the other fish we see.
On topic of stocking, agreed I would put something in that can handle a FM (though it can work with dithers). If it was my tank I would do a pair of FM and a pair of cons, with clear territories and something to block each others line of sight.