Great points. From Cap's P.O.V. there's a huge chance that him/Bucky vs 5 super soldiers all stronger than TWS would not survive the fight so of course he'd kiss Sharon to live a little whom he had the hots for since TWS.
That look on his face before he kissed her was, "AHHH FCK IT. I'VE LIKED YOU SINCE YOU WERE KATE. I'M THANKFUL FOR ALL YOUR VALUABLE HELP. I DON'T WANT TO WAIT FOR TOO LONG AND MISS MY CHANCE AGAIN AT HAPPINESS LIKE I DID WITH PEGGY. DAMN YOU'RE BEAUTIFUL. I MIGHT NOT RETURN FROM SIBERIA ALIVE. STUCKY SHIPPERS CAN EAT IT, I'M GONNA GET SOME."
Of course, because that's what the whole CW was about.

In the mind of Staron fanfic writer.
But if you're really into all these stupid shippers wars... Then of all pairings it's actully Stucky's shippers, who have won. Because love isn't measured in amount of kisses, it's about doings. Civil War is actually a testament of Steve's love for Bucky, Evans confirmed, that Cap loves Bucky more than anyone else, that he won't do the same for anybody else. And what has Cap actually done for Sharon? NOTHING. He used her, made her unnecessary risk her job (let's be honest, Cap and Sam could steal shield and wings by themselves, as they did in TWS. Heck, Cap even break in the Raft in the end without shield, it wouldn't be a big problem for him at all.) and then forgot about her.
Steve thought "there's a huge chance" to die in the fight with 5 supersoldiers?

You wish. But it's complete nonsense. He might thought it when they left with Bucky alone (although, I very much doubt even that, because when Bucky asked: "What's gonna happen to your friends?", Steve was very confident with reply:"Whatever it is,
I'll deal with it"), but on that moment he has called Clint and Scott, he didn't know that Sharon will lead team Stark to the airport, so he was expecting that it will be at least 6 of them against Winter Soldiers. And he had Wanda among them. Wanda could actually kick WSs asses all by herself.
The Russos have maintained that the relationship between Cap and Bucky was one of brothers. Of course they love each other, but it's a very platonic brotherly love. Believe it or not, not every relationship has to be a sexual one.
Learn to pay attention if you want to reply, that was not the point of my posts at all. No one here said that CapBucky is canon.
That being said, what the Russos have actually maintained is that "brothers" is THEIR interpretation, but people can interpret that relationship as they see it, and they are totally cool with it.