Fallen hero on warlock sounds awesome!
Really surprised you've rated Argent Watchman as a worse pilot than Druid of the Saber and Lance Bearer. While which would you'd prefer to get out of the shredder is going to be situational, I'd have to imagine that a 2/4 that can attack sometimes is going to be better than a 2/1 or a 1/2. How many people are happy when an Ironbeak Owl drops out of their Shredder?
Imagine the dumb "luck" if you put down TWO shredders and BOTH drop the Fallen Hero... LOL
Inb4 Trolden videos with people getting from both their shredders.