Ed Lewis in every way possible. The man trained Lou Thesz and invented professional wrestling.
Backland's technical ability doesn't even register in comparison to Lewis, who is arguably the greatest hooker ever to have lived. Ed Lewis had a record of something like six thousand wins to 80 losses. I don't think even Goldberg can match that ratio.
If this were a tournament based on who'd done the most for the business, then Lewis should be the number one. He was the first man to book feuds and to book wrestling cards (as oppose to one off events). As a member of the Goldust Trio, he was largely responsible for the proliferation of the worked style (works had happened before Lewis, but he institutionalised them).
Lewis is one of the greatest wrestlers ever to have lived, and should go over the majority of the names in this thing.
Backlund lost to Kevin Nash in under 60 seconds, I'm voting Lewis. I'll do a longer post later, but right now I'm cooking pie.