Sam is not comedic relief. He’s not a third wheel or a cockblocker. He’s one half of the relationship that carries the show, the epic love story of Sam and Dean. He’s not an extra tossed in to provide side entertainment to the Cas and Dean show. Without Sam there would be no show. Deal with it.
“But Sammy, come on. I killed Benny to save you…I’m willing to let this bastard, and all the sons of bitches that killed mom walk because of you. Don’t you dare think that there is anything past or present that I would put in front of you!”