Bertuzzi "earned" his spot in that he was the best option on the Wings to go. If they didn't need a rep from every team, not a chance in hell he makes it. Same with Larkin, really. Bertuzzi was taken over Larkin because the Atlantic's C depth >>> Atlantic's wing depth.
Larkin doesn't have absolutely no help. The Wings do have guys like Bertuzzi who do know how to play hockey. And when Larkin had a whole forward line of guys (Him, Bert, and Mantha), they were a fantastic line. However, with Mantha hurt, the line falls apart because you have a wing slot that is a negative and you've got to have Larkin and/or Bert spend more time covering the D side, which eats their offense. I mean, it's like pulling ****ing teeth discussing anything with you. Pastrnak has Bergeron and Marchand, I think. Probably the best 2-way C in the league and a 40 goal winger on the other side. Relative to what Pastrnak has on his line and in his D-core, Larkin has nothing. Bertuzzi is an ok to good player (0.65 PPG over past two years) and when Mantha is healthy, that's another good player. Right now though, no Mantha means a black hole on Larkin's wing, because that's how shallow the Wings' depth is currently. DDK being hurt and Green/Daley being hampered and old kills that aspect. When Larkin has talent anywhere near his level that he can play with, he looks amazing. When he is saddled with blackholes, he still looks okay and is only "bad" in comparison to himself when he's got support.