Not having an alt mode, a dramatically oversized gun arm, and being so spiky, he doesn't work for me. Granted, he's considerably better than FoC Shockwave. And of the two, he fills the hole, currently.
Shockwhirl, no. Legs are wrong. Shockwave is TFUS #5, period. Whirl is too spindly. Beast Hunters Shockers is a top toy, best Voyager from that line, but to make him a good G1 Shockwave he'd need adapting a bit (new head for a start). FoCShock is an evil abomination. Do not speak of him.
I do like that Energon Ironhide. It's certainly something of a leftfield choice, I'd been assuming Cloud figures would largely be classic characters (though must admit to not having followed Cloud closely, and have only a vague idea of what it's all about).
Energon Ironhide (called Roadbuster in Japan, so a natural fit) is a classic character now. Energon was 10 years ago.
Also, Sky-byte does indeed seem to be in BWII Starscream colours.
"I used to think it was a terrible thing that life was so unfair. Then I thought, 'what if life were fair, and all of the terrible things that happen to us came because we really deserved them?' Now I take great comfort in the general unfairness and hostility of the universe." — Marcus Cole, Babylon 5 — A Late Delivery from Avalon