Opinions on whether or not a round opening hole can/should be patented or copyrighted are irrelevant. The facts are that Spyderco did have a patent on the round opening hole, but it has expired. Spyderco does still have an active trademark on the round hole, as it's a design recognizable as belonging to Spyderco. Don't give me this "you can't trademark a hole" crap, because whether or not you think it should be allowed, it is allowed, as evidenced by the fact that the trademark was granted to Spyderco. It's a logo as much as any other. Coke has a trademark on a bottle shape. John Deere is the only company that can paint things that specific shade of green.
Benchmade has an agreement with Spyderco to use the round opening hole. Nothing more needs to be said; it's between them.
As for the ballbearing lock vs the AXIS lock, they're practically nothing alike, in terms of patent law. They might work on the same physics, and have similar means of operation by the user, but mechanically they're very different. There's thousands of patents out there that are far more similar than those 2 locks, yet don't infringe on each other. Look around you and you'll see them; clicky pens, anti-lock-break systems, the fabric weave on duck tape, the way a cardboard box is folded and glued together, etc.
As for the assistedknife guy, he's a shady businessman, and a raving lunitic with an absurd vendetta against Benchmade. I'm thinking that BM threatened him with (or even went through with) legal action for selling counterfeit Benchmades. If you look on his website there's some knives that are available in some places with the Bali-Song butterfly logo, but are also available without (his are without the logo). It's possible he sold some with the counterfeit logo in the past, and was threatened by Benchmade. I don't know exactly what sparked his vendetta with BM, but the fact that he rants about BM suing people for stuff he considers ridiculous leads me to believe that he was sued or threatened himself. EDIT: I poked around his vendetta page, and sure enough, he was sued for selling automatic Benchmite clones, using BM's logos/names, amongst other things. He claims the lawsuit was brought on by him complaining about Benchmade price-fixing (requiring authorized dealers to sell at their MSRP), yet asking them at the same time why he couldn't become a dealer himself.
Now he goes around bashing Benchmade as being morally and ethically bankrupt for "stealing designs" and whatnot. But when you poke around his site you can find several knives that are Chinese made copys/clones/ripoffs of other knives. Add to this the fact that all imported automatics and balisongs, in part or as whole, are illegal contraband. It doesn't matter that they made it to the US without being confiscated, they're still contraband.
Do a search for member roadsideimports (same guy) and marvel at his lunacy.