I feel like this harkens back to debates about McD and Kreider over the years, and whether the former was a #1 defenseman and the latter a first line left wing.
Is Strome in the conversation as a second line center? Yes he is.
Now, we can debate whether he benefits more from who he plays with than they benefit from him. We can also debate whether he's probably in the lower half of second line centers, and whether he sniff the second line on a top team. But the useage, the icetime, the production, and ultimately, the results, paint a picture of a guy who, at this stage in his career, is making a solid case for being classified as a second line center.
Now we can debate whether he'll remain in this neighborhood, and whether his peak will extend beyond last year and this year, but right now, he's arguably there --- and regardless of the reason, he keeps finding ways to produce over the last two years.