I ask of you to please read the thread before asking things such as those. The thread describes all...because seriously i cannot take you seriously if you are going to be close-minded, if you think it cannot work with such a dead set on it, then it wont. However please read the entire thread that i linked, it answers some of the questions you already have.

you'd need alot of Emnity to be able to pull this sub job off.
Who said Enimity Gear isnt used? He doesnt have all his AF but he does have some pieces, including a Parade Curaiss(same enimity as AF Body). And High Breath Mantle(only 70K). Did you not read the thread at all? If you didnt read it, please read it before posting.

I personally helped conduct a few experiments with this combination before the party that the OP posted about, and i was very surprised at the results.

NIN's arent very good tanks in my opinion, go to FFvault, or any other site, and go to the RNG forums, they all have a problem with NIN telling them to "Hold back", otherwise the NIN would lose hate... this is true >_> the same problem would plague your /RDM sub as a PLD, but this time you dont have Provoke, although your Enfeebs might help...
I wouldnt care too much about what people think as a whole, theres alot of idiots. RNG is nerfed and useless, lol DRK and lol DRG, or lolPLD in merit pts. I only care about hard facts and stuff if it comes down to it. And i have also known NINs that can hold hate very very well also, and a simple Provoke could be all they need to hold the hate back after some big hate spike.

PLDs have alot more hate keeping tools than NIN that being said, and i urge you to please be more informed before commenting >< (this is not a flame, but your posts indicate you didnt even read the thread yet). I refuse to believe that Provoke which is a WAR ability, is something a PLD needs to survive. Alot of people are a little worried that theres no Provoke, however Provoke is not the end all be all.