Let's go through this.
1. A LOT of people of insulted America and claimed superiority elsewhere. Iron Sheik, General Adnan w/ Sgt. Slaughter, The Un-Americans, Team Canada, a number of foreign born United States Champions. It's a very broad feature among wrestling characters. And as stated before Hassan wasn't a foreigner claiming superiority. He was an American of Middle Easter Descent who was angry over being stereotyped.
2. Yes, they both have the Camel Clutch. Again, so do a lot of people.
3. They both have managers. Again, so do a lot of people. Brock Lesnar has Paul Heyman. Is Rusev another Brock Lesnar? Jack Swagger has Zeb colter. Is Rusev another Jack Swagger? Undertaker had Paul Bearer. Is Rusev another Undertaker?
The three similarities you pointed out are just broad claims that so happen to fit both men, as they fit a lot of other people. Difference being, Hassan actually got heat. People care way more about Lana than Rusev.
Also, WWE wouldn't want to make another Muhammad Hassan. Hassan was a character who got hot and six months later disappeared never to be seen again when things went south. If anything they wouldn't want to make "another Muhammad Hassan" they would try to make something that is "what Muhammad Hassan" should have been. Being another Muhammad Hassan is as useful as being another Gobbly Gooker, or another Shockmaster. I'm almost certain not a single person in that company is saying, "Let's make him another Muhammad Hassan"
Also, if I may be a grammar nazi here. Rusev is a name. Which means it should be capitalized. With an upper case R. Rusev, not rusev.