Larkin scored 17 and 16 goals the last 2 years in full seasons, he may be Detroit's top C but he is not a top tier C by any stretch.
Trouba plays more that 20 minutes as well and tough minutes. It's not Myers being offered.
Those players may not be easily available but they are for the right offer which certainly could have Trouba as the key piece, especially if the team getting him can ensure it is long term.
"Not available" is a lazy default, lots of better players have been traded, and recently. May not be 1 800 dial a trade but that position wasn't what was stated.
Yah, that's the basic trade boards fallacy we've seen so often.
Step one: find target you really want (Trouba)
Step two: find flaws (lack of PP production, injuries, holdout two years ago)
Step three: conclude that due to flaws the player is "available for the right offer"
Step four: ignore team needs ("This top6 winger could certainly be the key piece of the right offer that could land Trouba")
Detroit's centers are Larkin, a 37-year-old Zetterberg who hasn't even decided yet if he's going to play next season, 34-year-old Frans Nielsen who scored 33 points last season, and a couple of bottom six center/wingers who have never scored 35 points in their careers (Helm, Glendening). Their only center prospect of note is 19 years old.
You think they would make Larkin available for the "right offer"? I think so too, but the "right offer" clearly must be a high-end center.
Do you think Trouba is good enough that they would entertain going into next season with Nielsen and Helm being their top6 centers?
(I also hope you're aware that 20 minutes as a forward and 20 minutes as a defenseman are different. 19 forwards averaged over 20 minutes last year leaguewide. Trocheck ranks 6th in TOI/GP.)