Chris Jericho got a strong push?
WWE hasn't been all filled with huge, muscular wrestlers throughout its history. What about wrestlers like Bret Hart, Chris Benoit, Shawn Michaels, Edge, CM Punk, RVD, Eddie Guerrero, and others? These wrestlers are all small as Chris Jericho, but they have all held World titles inside the WWE. Some might not have had the success Chris Jericho has had as a 6 time World Champion, but all these wrestlers I named have been to the top of the WWE before. Chris Jericho doesn't particularly stand out because there have been tons of wrestlers who have succeeded at Chris Jericho's size. Chris Jericho has mic skills and charisma, but he's not the only wrestler to have succeeded in the WWE with charisma and mic skills for his size.
Also, Chris Jericho has mostly been between 220-240 pounds in the WWE. I would say that its natural he's competing with guys around 240-250 pound guys like Triple H, Stone Cold, John Cena, and others.
I don't see what you mean about a huge push for Chris Jericho. The reason Chris Jericho defeated The Rock and Stone Cold was for one reason only. Triple H was returning and would defeat Chris Jericho at Wrestlemania. Chris Jericho only won the title to lose to Triple H at Wrestlemania. They wanted a program with him and Stephanie McMahon against Triple H, so they made him World Champion so he could eventually lose to Triple H. If we look at his other title reigns, they're also similar. He won the World Heavyweight title in 2008 to have a Ladder match with Shawn Michaels to continue their feud and lost to Batista. He won the title back only to lose to John Cena. Don't you see a pattern? Jericho has NEVER won the World title to be a top star. He always won the World title to lose it to another star shortly.
If Jericho was pushed strongly, he would have been a consistent main eventer in the WWE. Has Jericho consistently been in the main event? In the 90s, Triple H, Stone Cold, and The Rock were mostly dominating the main event picture and Jericho occasionally main evented. Jericho has been off and on the main event scene for years now. Has he consistently stayed like the other main eventers such as Triple H, John Cena, Batista, Edge, Randy Orton, The Undertaker, and others? No he hasn't. He's been in the mid card feuding with mid carders as well. If he was strongly pushed, he would be right up there with the rest of WWE's main eventers consistently main eventing. Jericho doesn't seem to be in the same list as the other main eventers.
I certainly don't think WWE has given a strong push to Chris Jericho.
BQ: Chris Jericho is NOT the one exception to the rule. Bret Hart was the face of WWF in the early to mid 90s and he was just as small as Jericho. Shawn Michaels is the first ever grand slam champion in the WWE and he's smaller than Jericho. Also, Edge has won 7 of his titles without MITB, which is still a large number of titles. There's no way that Jericho is the one exception.
BQ2: I already stated that Jericho was never pushed as strongly as WWF's main guys. When WWF signed WCW wrestlers after they bought out WCW, most of the WCW wrestlers were kept under the main WWF wrestlers. Jericho was never the biggest star in any point. Even when he was the Undisputed champion, Stone Cold, The Rock, and Triple H were bigger stars. It's logical to turn a star from a rival promotion into a top star to encourage more wrestlers to join, but WWE has never done that. They always had stars they built as the top stars of the company.
EDIT: Don't mind the TD. Makes me laugh to see that someone has no life to TD me repeatedly, but TU everyone else's answers. Gotta love the hate.