His name is Andre Tricoteux, he's a stunt man. We have knwon that for awhile. There's no reason we would know who the actual voice talent is this early.
That's pretty much the leads job though. With the comics it's Wolverine, Cable or Psylocke. For humor you add people like Deadpool or Boom Boom in there.
X-Force is a pretty dark comic, the only X book outside of Deadpool and Wolverine rated Mature. So naturally this team is represented through the more dark and aggressive characters. The Yost and Remender run especially. All these characters clash with eachother cause they have authority and trust issues along with different motives. Just cause they are more violent and destructive doesn't mean they share the same personality.
Now someone like Colossus would either stand down, tell Prof X or try to stop them everytime someone pointd a gun and was about to pull the trigger. He's perfect for the themes of the Deadpool film because they are trying to show that line between hero, villain and anti-hero. But for him to actually be on a team that is known for having a roster of pretty much all assassins, mercs etc is off for the character. Characters like him, Storm, Kitty, Iceman and Beast don't really belong here. Unless they are some sort of alt dark version of themselves. Like Dark Angel Saga had with Nightcrawler. Which was a much more blood thirsty and revenge seeking version of himself. He straight out threw AOA Iceman in a furnace and wanted nothing more then to murder the Blob for what he did to his wife. He was also a double crosser.