Hello there Buddha has nothing to do with being any Awtars of Vishnu -bullshit- on wikipedia they write any damn thing over here and people like us try to clarify and the next thing you know it the moderators go deleting the stuff within seconds thats why I came here on the talk page. Half of wikipedia is all false and the real stuff gets deleted all the time!!!!!!!!!!! 
 They just want to promote the buddism and blow it out of proportion and say its linked with a Hindu God. Absolutely incorrect, he was a King (they say he was a jutt/jatt also)and he left his Kingdom at the time King Asoka was repenting for all the deaths of the war so Buddha stated his religion of non violence.  
 Many people leave their riches to become priests and saints its quite common. 

  Now when did Vishnu awtar "Krishna" say don't kill at all, he never said don't kill he said kill all your relatives to Arjun, if you read the Bagavadgita then you will undestand the concept entirely. Even the Awtar Parshuram killed all the kshatriyas then why did he kill them himself. When Vishnu came as Narsimha he killed Hiranyakashyap too. 
 When Vishnu awtar came as Matsa awtar then why did all of the people drown and only the so called "Noah" (of western thought) and his ark survived? Where did the rest of the people go they died or were killed too isn't it. 
 Bhuddist philosophy is totally different than Hindus it doesn't match at all. They have even their own different deities with different names. 
 So it's absolutely impossible that Buddha is an awtar of Vishnu.