Man, now I have to dive into this after all
I should have been clearer, you can't get the nine together in fell rider of corse, but if Khamul goes for it in black rider he still has a benifit over WK in that his card is a perm and you can start with one. Of course you might recycle WKU alot, but I suppose KU is better for timing issues. I just had not considerend you might play KU without any intention of playing fell rider, it seems unnatural to the card...
Wether WKU as follower is too strong or wether, as you say, this strategy (TRT) 'needs the little boost', I truly don't know because I havent played it and it is a rather big strat. Marcos keeps insisting getting the nine is virtually (hehe) impossible, so I take his word for it. If you go for it with Khamul, I suppose WKU won't be even in deck. But, maybe it'll make TRT more of an easier side-strategy that you use in longer games, then you don't have to set it up straight away, you get your mojo going when you got nr. 1 and 2 in play.
I'm not sure what playing WKU as follower means to other RW strategies. I suppose in general its always useful to catch the Blades and use the Crown, but as far as grabbing followers at havens, outside TRT? It's always useful to have an extra guy of course, and you don't have to worry about them being discarded on bodycheck anymore, but to get WKU from sideboard for this...
If it is to go between the darkhaven playability and the follower playability, I'd prefer, hmmm, don't know. Both seems too much of an alround booster. Though I prefer WK as active guy and not as TRT helper, I'd still prefer haven playability. I'm scared of the Blades and Crown.
Btw. Khamul is, supposedly because it's all a guess, keeper of Dol Goldur and nr. 2. So, what if he is follower of nr. 3 Dwar, would he not temporarily be giving over command also, maintaining his unleashed ability? or is this feat only reserved for the supreme leader, well next to supreme of course, only the orders from Lugburz are definite

Stone-age did not end because man ran out of rocks.