So you're sure the evidence is there, you just don't have it.
First, TBTLC would actually have to center the third line, which he hasn't done since shortly after Babs dubbed him that. He was an unproductive second line winger until Blash moved him to Glendening's wing last year.
If you need evidence so bad why not Google it yourself? Not everyone on the internet cares about trying to convince random people of what they already know.
This team has had identity and depth issues for a few years now. It is of zero surprise that Helm had to log a lot of top 6 minutes. Despite the fact this team is nowhere near contention, at least now there is enough depth to have actual top six players play in the top six. I'd fully expect to see Helm back on the third line this season. If not, the management of this team will just continue to show incompetence.