I've outlined previously how I see each of the three back row positions ought to work (to my mind anyway). To wit:
Scotty, I take a very similar view to yours. Each spot in the back row requires a different sort of player and balance is important. Like you, I feel we need:
1, A fetcher, someone who is always at the breakdown, securing our ball or stealing theirs. They have the skills to link with the backs and the pace and/or smarts to always be at the right spot at a given time.
2, An enforcer, someone who often plays blindside and puts the hurt on in defence, carries the ball into contact, cleans out at ruck time and generally puts the shits up the opposition. These guys are often the biggest mongrels in a team (that's a term of endearment, BTW).
3, A perpetual motion machine, who is consistently carrying the ball up in attack and especially around the fringes, breaks or bends the line, spot tackles, provides a lineout option and covering field position for kicks and line breaks. In other words, your classical eight.
We have the fetcher, no problem there.
Rocky is much better suited to blindside, IMHO, than Higgers. He has a harder edge to his game and does more clean out at ruck time. He is also a good defender who knows how to knock blokes over.
Higgers is better in a ball carrying situation, can run off the back of a scrum, has good hands and is fast. He is also a guy who runs good support lines and knows where to be on kick return and other aspects with respect to field position. He's not an eight in the Palu mould, but he offers something different. When we need a guy to be the sledgehammer, we have Samo. The fact that we have the quartet of Pocock, Elsom, Higginbotham and Samo means that we can vary our game depending on the opposition and the situation. I'd like Cliffy to be in the mix too, but I have a suspicion that he's not going to make it.