If Silva has so many options at HW with Elite XC then why is the first title bout against a complete palooka and UFC reject like Eilers?
I'll answer that since you'll probably straw man it anyway.
Because Elite XC, even allowing for some cross promotion, has so little talent at HW that that is the best they can do.
This is still hardly an argument that Silva should go to UFC, who has no HW Championship belt available. There is no one to fight at UFC for Silva either. I don't see him fighting Nog, Gonzaga and Kongo are overrated, a win over Herring wouldn't do a whole lot for his career (sorry Heath, I still love ya), Lesnar's a noob, so that only leaves Werdum. And I don't think casuals would see a win over Werdum and go nuts for Bigfoot.
Affliction has the majority of great heavywieghts right now. It's best for any heavywieght in today's MMA landscape to either remain a free agent or sign with a company that cross promotes... Like Elite XC